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

<!--XBRL Document Created with Wdesk from Workiva-->
<!--Copyright 2022 Workiva-->
<!--r:2db984e8-f48c-4b8e-9f0b-bc2e9abaf2d9,g:4410bbe3-c1ad-4430-b8aa-fceed1c4078e-->
<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-20220307.xsd#CoverPage"/>
  <link:definitionLink xlink:role="http://weedmaps.com/role/CoverPage" xlink:type="extended" id="icc7c9381d2e9455d820821a2b485b94c_CoverPage">
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityInformationLineItems_540f31f5-8417-438c-8b6b-1260f80d1ef1" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_EntityInformationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentType_8a6ec136-40aa-4012-a79e-efba7d630afe" 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_540f31f5-8417-438c-8b6b-1260f80d1ef1" xlink:to="loc_dei_DocumentType_8a6ec136-40aa-4012-a79e-efba7d630afe" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentPeriodEndDate_76116b93-42b1-48f1-a700-b4fd267fd1d9" 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_540f31f5-8417-438c-8b6b-1260f80d1ef1" xlink:to="loc_dei_DocumentPeriodEndDate_76116b93-42b1-48f1-a700-b4fd267fd1d9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityRegistrantName_372c0e9f-82c0-48e4-a488-f103a5135fdc" 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_540f31f5-8417-438c-8b6b-1260f80d1ef1" xlink:to="loc_dei_EntityRegistrantName_372c0e9f-82c0-48e4-a488-f103a5135fdc" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityIncorporationStateCountryCode_87997044-d714-4da1-a311-457f1e04be83" 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_540f31f5-8417-438c-8b6b-1260f80d1ef1" xlink:to="loc_dei_EntityIncorporationStateCountryCode_87997044-d714-4da1-a311-457f1e04be83" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityFileNumber_bd9d5e61-e191-4492-965e-c2c78fee4bff" 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_540f31f5-8417-438c-8b6b-1260f80d1ef1" xlink:to="loc_dei_EntityFileNumber_bd9d5e61-e191-4492-965e-c2c78fee4bff" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityTaxIdentificationNumber_8fbb142b-5b0e-428d-90ad-0d2755f1169b" 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_540f31f5-8417-438c-8b6b-1260f80d1ef1" xlink:to="loc_dei_EntityTaxIdentificationNumber_8fbb142b-5b0e-428d-90ad-0d2755f1169b" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressAddressLine1_39568009-9ef3-4ab4-9e64-f0648ba401e3" 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_540f31f5-8417-438c-8b6b-1260f80d1ef1" xlink:to="loc_dei_EntityAddressAddressLine1_39568009-9ef3-4ab4-9e64-f0648ba401e3" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressCityOrTown_78260878-0436-43eb-a9ce-960d7a88cab4" 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_540f31f5-8417-438c-8b6b-1260f80d1ef1" xlink:to="loc_dei_EntityAddressCityOrTown_78260878-0436-43eb-a9ce-960d7a88cab4" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressStateOrProvince_ae085be2-bf18-46e0-b28e-68e4a0dd1169" 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_540f31f5-8417-438c-8b6b-1260f80d1ef1" xlink:to="loc_dei_EntityAddressStateOrProvince_ae085be2-bf18-46e0-b28e-68e4a0dd1169" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressPostalZipCode_6b151f17-eff8-4a9e-a343-2ae49518bf59" 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_540f31f5-8417-438c-8b6b-1260f80d1ef1" xlink:to="loc_dei_EntityAddressPostalZipCode_6b151f17-eff8-4a9e-a343-2ae49518bf59" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_CityAreaCode_2b06fb22-963e-488e-9915-c41c3f0e6d87" 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_540f31f5-8417-438c-8b6b-1260f80d1ef1" xlink:to="loc_dei_CityAreaCode_2b06fb22-963e-488e-9915-c41c3f0e6d87" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LocalPhoneNumber_8201deda-eb79-44ec-bdec-93439c88ea67" 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_540f31f5-8417-438c-8b6b-1260f80d1ef1" xlink:to="loc_dei_LocalPhoneNumber_8201deda-eb79-44ec-bdec-93439c88ea67" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_WrittenCommunications_04ecbfca-2f9c-4e20-b60f-3bc96a6944c4" 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_540f31f5-8417-438c-8b6b-1260f80d1ef1" xlink:to="loc_dei_WrittenCommunications_04ecbfca-2f9c-4e20-b60f-3bc96a6944c4" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_SolicitingMaterial_2e01b0e6-3891-4c78-a8cf-563af007ed0b" 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_540f31f5-8417-438c-8b6b-1260f80d1ef1" xlink:to="loc_dei_SolicitingMaterial_2e01b0e6-3891-4c78-a8cf-563af007ed0b" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_PreCommencementTenderOffer_935ecf65-c7ed-43e2-868b-1aab71b78b1f" 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_540f31f5-8417-438c-8b6b-1260f80d1ef1" xlink:to="loc_dei_PreCommencementTenderOffer_935ecf65-c7ed-43e2-868b-1aab71b78b1f" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_PreCommencementIssuerTenderOffer_a08478e8-8284-41ce-bacd-05a60d306e94" 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_540f31f5-8417-438c-8b6b-1260f80d1ef1" xlink:to="loc_dei_PreCommencementIssuerTenderOffer_a08478e8-8284-41ce-bacd-05a60d306e94" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_Security12bTitle_3a8479f9-6b3e-4d03-a96f-8bc5d3b65620" 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_540f31f5-8417-438c-8b6b-1260f80d1ef1" xlink:to="loc_dei_Security12bTitle_3a8479f9-6b3e-4d03-a96f-8bc5d3b65620" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_TradingSymbol_763b81fa-77c9-4545-b787-ab8191e67aea" 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_540f31f5-8417-438c-8b6b-1260f80d1ef1" xlink:to="loc_dei_TradingSymbol_763b81fa-77c9-4545-b787-ab8191e67aea" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_SecurityExchangeName_33bd9580-dde5-4223-b467-783b110d7bc1" 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_540f31f5-8417-438c-8b6b-1260f80d1ef1" xlink:to="loc_dei_SecurityExchangeName_33bd9580-dde5-4223-b467-783b110d7bc1" xlink:type="arc" order="18"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityEmergingGrowthCompany_8cc4d8b6-1ffa-4980-9456-eda7908ffafd" 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_540f31f5-8417-438c-8b6b-1260f80d1ef1" xlink:to="loc_dei_EntityEmergingGrowthCompany_8cc4d8b6-1ffa-4980-9456-eda7908ffafd" xlink:type="arc" order="19"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityCentralIndexKey_d6df30e7-e8e2-4f3c-868d-e7a098328527" 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_540f31f5-8417-438c-8b6b-1260f80d1ef1" xlink:to="loc_dei_EntityCentralIndexKey_d6df30e7-e8e2-4f3c-868d-e7a098328527" xlink:type="arc" order="20"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_AmendmentFlag_b4762d94-3db1-423a-8c85-65cc70a489b3" 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_540f31f5-8417-438c-8b6b-1260f80d1ef1" xlink:to="loc_dei_AmendmentFlag_b4762d94-3db1-423a-8c85-65cc70a489b3" xlink:type="arc" order="21"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntitiesTable_fa012d04-6d7b-44d9-b91e-1f416d4a4b18" 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_540f31f5-8417-438c-8b6b-1260f80d1ef1" xlink:to="loc_dei_EntitiesTable_fa012d04-6d7b-44d9-b91e-1f416d4a4b18" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_fea4b3d4-3c88-408c-82e2-3bcac0cd9c3b" 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_fa012d04-6d7b-44d9-b91e-1f416d4a4b18" xlink:to="loc_us-gaap_StatementClassOfStockAxis_fea4b3d4-3c88-408c-82e2-3bcac0cd9c3b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_fea4b3d4-3c88-408c-82e2-3bcac0cd9c3b_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_fea4b3d4-3c88-408c-82e2-3bcac0cd9c3b" xlink:to="loc_us-gaap_ClassOfStockDomain_fea4b3d4-3c88-408c-82e2-3bcac0cd9c3b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_47d1a5cc-af92-472c-b540-3b13328db938" 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_fea4b3d4-3c88-408c-82e2-3bcac0cd9c3b" xlink:to="loc_us-gaap_ClassOfStockDomain_47d1a5cc-af92-472c-b540-3b13328db938" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonClassAMember_c649729f-b58a-4840-86a2-8c9576076ab3" 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_47d1a5cc-af92-472c-b540-3b13328db938" xlink:to="loc_us-gaap_CommonClassAMember_c649729f-b58a-4840-86a2-8c9576076ab3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WarrantMember_b708c167-63fc-4db2-a4df-faf58d2a7539" 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_47d1a5cc-af92-472c-b540-3b13328db938" xlink:to="loc_us-gaap_WarrantMember_b708c167-63fc-4db2-a4df-faf58d2a7539" xlink:type="arc" order="1"/>
  </link:definitionLink>
</link:linkbase>
