<?xml version="1.0" encoding="UTF-8"?>

<!--XBRL Document Created with Wdesk from Workiva-->
<!--Copyright 2021 Workiva-->
<!--r:7d70f4e8-752d-498f-a9db-b4975479aff1,g:dd6c039b-71fa-45e2-ba85-77e6e375cb87-->
<link:linkbase xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xbrldt="http://xbrl.org/2005/xbrldt" xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd">
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/all" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#all"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#hypercube-dimension"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-default"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-domain"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/domain-member" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#domain-member"/>
  <link:roleRef roleURI="http://weedmaps.com/role/CoverPage" xlink:type="simple" xlink:href="maps-20210812.xsd#CoverPage"/>
  <link:definitionLink xlink:role="http://weedmaps.com/role/CoverPage" xlink:type="extended" id="ice88f9a575c5407ba49ff8e7ab8571d1_CoverPage">
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityInformationLineItems_7d4c044d-6032-4bdc-9f51-722b0b44c194" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_EntityInformationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentType_126947ad-8c05-42d3-b343-3611efc1b3dc" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_DocumentType"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_7d4c044d-6032-4bdc-9f51-722b0b44c194" xlink:to="loc_dei_DocumentType_126947ad-8c05-42d3-b343-3611efc1b3dc" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentPeriodEndDate_9d454315-f88d-4d6a-ae9d-d92434bc4b2f" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_DocumentPeriodEndDate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_7d4c044d-6032-4bdc-9f51-722b0b44c194" xlink:to="loc_dei_DocumentPeriodEndDate_9d454315-f88d-4d6a-ae9d-d92434bc4b2f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityRegistrantName_3a21be06-8085-4507-87f7-a66b39dc1afd" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_EntityRegistrantName"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_7d4c044d-6032-4bdc-9f51-722b0b44c194" xlink:to="loc_dei_EntityRegistrantName_3a21be06-8085-4507-87f7-a66b39dc1afd" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityIncorporationStateCountryCode_7c5d3277-e531-4906-a623-7284f6d049b6" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_EntityIncorporationStateCountryCode"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_7d4c044d-6032-4bdc-9f51-722b0b44c194" xlink:to="loc_dei_EntityIncorporationStateCountryCode_7c5d3277-e531-4906-a623-7284f6d049b6" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityFileNumber_99b607fd-4fe0-4465-9be7-3b1e4ea5d678" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_EntityFileNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_7d4c044d-6032-4bdc-9f51-722b0b44c194" xlink:to="loc_dei_EntityFileNumber_99b607fd-4fe0-4465-9be7-3b1e4ea5d678" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityTaxIdentificationNumber_02ca3266-4310-419a-8d0d-2498957bd2d3" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_EntityTaxIdentificationNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_7d4c044d-6032-4bdc-9f51-722b0b44c194" xlink:to="loc_dei_EntityTaxIdentificationNumber_02ca3266-4310-419a-8d0d-2498957bd2d3" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressAddressLine1_962bb3d4-d31c-414c-90e5-f709492dfb4b" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_EntityAddressAddressLine1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_7d4c044d-6032-4bdc-9f51-722b0b44c194" xlink:to="loc_dei_EntityAddressAddressLine1_962bb3d4-d31c-414c-90e5-f709492dfb4b" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressCityOrTown_76ad39e1-6a87-4098-adef-5a7dca3e36d8" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_EntityAddressCityOrTown"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_7d4c044d-6032-4bdc-9f51-722b0b44c194" xlink:to="loc_dei_EntityAddressCityOrTown_76ad39e1-6a87-4098-adef-5a7dca3e36d8" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressStateOrProvince_289426d9-c453-48f5-b04b-7b0679b8f173" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_EntityAddressStateOrProvince"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_7d4c044d-6032-4bdc-9f51-722b0b44c194" xlink:to="loc_dei_EntityAddressStateOrProvince_289426d9-c453-48f5-b04b-7b0679b8f173" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressPostalZipCode_e10bc428-b413-4230-8dce-f88cf03933b7" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_EntityAddressPostalZipCode"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_7d4c044d-6032-4bdc-9f51-722b0b44c194" xlink:to="loc_dei_EntityAddressPostalZipCode_e10bc428-b413-4230-8dce-f88cf03933b7" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_CityAreaCode_8c25b4dc-b66e-4f57-b6ac-6708ed861133" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_CityAreaCode"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_7d4c044d-6032-4bdc-9f51-722b0b44c194" xlink:to="loc_dei_CityAreaCode_8c25b4dc-b66e-4f57-b6ac-6708ed861133" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LocalPhoneNumber_baa2489e-21e7-4a3e-97fa-d87bdcd08fe4" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_LocalPhoneNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_7d4c044d-6032-4bdc-9f51-722b0b44c194" xlink:to="loc_dei_LocalPhoneNumber_baa2489e-21e7-4a3e-97fa-d87bdcd08fe4" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_WrittenCommunications_b4a43c51-359f-48af-99b1-b7248fca4f6c" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_WrittenCommunications"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_7d4c044d-6032-4bdc-9f51-722b0b44c194" xlink:to="loc_dei_WrittenCommunications_b4a43c51-359f-48af-99b1-b7248fca4f6c" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_SolicitingMaterial_83e78fd8-8bea-4e61-8aa4-0f437619d756" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_SolicitingMaterial"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_7d4c044d-6032-4bdc-9f51-722b0b44c194" xlink:to="loc_dei_SolicitingMaterial_83e78fd8-8bea-4e61-8aa4-0f437619d756" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_PreCommencementTenderOffer_d785d865-245c-4458-83d0-54f95ae27754" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_PreCommencementTenderOffer"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_7d4c044d-6032-4bdc-9f51-722b0b44c194" xlink:to="loc_dei_PreCommencementTenderOffer_d785d865-245c-4458-83d0-54f95ae27754" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_PreCommencementIssuerTenderOffer_b3a06087-2afd-439e-b1cf-2a44f5cdf48d" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_PreCommencementIssuerTenderOffer"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_7d4c044d-6032-4bdc-9f51-722b0b44c194" xlink:to="loc_dei_PreCommencementIssuerTenderOffer_b3a06087-2afd-439e-b1cf-2a44f5cdf48d" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_Security12bTitle_155ac249-42ed-486a-ad69-1f61844f692f" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_Security12bTitle"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_7d4c044d-6032-4bdc-9f51-722b0b44c194" xlink:to="loc_dei_Security12bTitle_155ac249-42ed-486a-ad69-1f61844f692f" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_TradingSymbol_b01eb3fd-a9e7-4a87-aa55-16ecf0f6095c" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_TradingSymbol"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_7d4c044d-6032-4bdc-9f51-722b0b44c194" xlink:to="loc_dei_TradingSymbol_b01eb3fd-a9e7-4a87-aa55-16ecf0f6095c" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_SecurityExchangeName_c959a749-9345-4a26-84cf-edcb61f8c50b" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_SecurityExchangeName"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_7d4c044d-6032-4bdc-9f51-722b0b44c194" xlink:to="loc_dei_SecurityExchangeName_c959a749-9345-4a26-84cf-edcb61f8c50b" xlink:type="arc" order="18"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityEmergingGrowthCompany_0b3bd2a7-cab3-4720-8897-c35b0510f04b" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_EntityEmergingGrowthCompany"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_7d4c044d-6032-4bdc-9f51-722b0b44c194" xlink:to="loc_dei_EntityEmergingGrowthCompany_0b3bd2a7-cab3-4720-8897-c35b0510f04b" xlink:type="arc" order="19"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityExTransitionPeriod_2ec6b86d-3bb1-47bd-9c24-93a6b2869f77" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_EntityExTransitionPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_7d4c044d-6032-4bdc-9f51-722b0b44c194" xlink:to="loc_dei_EntityExTransitionPeriod_2ec6b86d-3bb1-47bd-9c24-93a6b2869f77" xlink:type="arc" order="20"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityCentralIndexKey_1553644d-f96f-472f-9002-62983de97b74" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_EntityCentralIndexKey"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_7d4c044d-6032-4bdc-9f51-722b0b44c194" xlink:to="loc_dei_EntityCentralIndexKey_1553644d-f96f-472f-9002-62983de97b74" xlink:type="arc" order="21"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_AmendmentFlag_e9a37bc1-e9bd-47c1-abfa-4eb07cf8281b" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_AmendmentFlag"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_7d4c044d-6032-4bdc-9f51-722b0b44c194" xlink:to="loc_dei_AmendmentFlag_e9a37bc1-e9bd-47c1-abfa-4eb07cf8281b" xlink:type="arc" order="22"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntitiesTable_62416470-a140-4c5b-a539-7ebef82755a4" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_EntitiesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_dei_EntityInformationLineItems_7d4c044d-6032-4bdc-9f51-722b0b44c194" xlink:to="loc_dei_EntitiesTable_62416470-a140-4c5b-a539-7ebef82755a4" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_a901c058-eebf-40e6-9a7d-169105c760bf" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementClassOfStockAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_dei_EntitiesTable_62416470-a140-4c5b-a539-7ebef82755a4" xlink:to="loc_us-gaap_StatementClassOfStockAxis_a901c058-eebf-40e6-9a7d-169105c760bf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_a901c058-eebf-40e6-9a7d-169105c760bf_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_a901c058-eebf-40e6-9a7d-169105c760bf" xlink:to="loc_us-gaap_ClassOfStockDomain_a901c058-eebf-40e6-9a7d-169105c760bf_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_f4183bed-fe6c-4a7c-84d0-e33a6937331e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_a901c058-eebf-40e6-9a7d-169105c760bf" xlink:to="loc_us-gaap_ClassOfStockDomain_f4183bed-fe6c-4a7c-84d0-e33a6937331e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonClassAMember_c621c646-a266-4079-a5f8-d56c00e9946f" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CommonClassAMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_f4183bed-fe6c-4a7c-84d0-e33a6937331e" xlink:to="loc_us-gaap_CommonClassAMember_c621c646-a266-4079-a5f8-d56c00e9946f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WarrantMember_781da5da-1374-4a41-9ad0-886278603c82" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_WarrantMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_f4183bed-fe6c-4a7c-84d0-e33a6937331e" xlink:to="loc_us-gaap_WarrantMember_781da5da-1374-4a41-9ad0-886278603c82" xlink:type="arc" order="1"/>
  </link:definitionLink>
</link:linkbase>
