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

<!--XBRL Document Created with the Workiva Platform-->
<!--Copyright 2023 Workiva-->
<!--r:6afe329b-d4dc-43d8-bc8c-e0b1673c2421,g:1d4e368d-f152-41d7-abfc-6a4e2d7c9513-->
<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-20231002.xsd#CoverPage"/>
  <link:definitionLink xlink:role="http://weedmaps.com/role/CoverPage" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityInformationLineItems_a75f3c97-23fc-4869-9f9d-71d0f9d654ee" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_EntityInformationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentType_4f48385e-c64a-4d9b-a7e4-1f2b16f97cfa" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_DocumentType"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_a75f3c97-23fc-4869-9f9d-71d0f9d654ee" xlink:to="loc_dei_DocumentType_4f48385e-c64a-4d9b-a7e4-1f2b16f97cfa" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentPeriodEndDate_5574e9c6-882c-436c-9484-7ba4473e72e8" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_DocumentPeriodEndDate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_a75f3c97-23fc-4869-9f9d-71d0f9d654ee" xlink:to="loc_dei_DocumentPeriodEndDate_5574e9c6-882c-436c-9484-7ba4473e72e8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityRegistrantName_fac4c4af-59de-44cf-b47c-524e285e9991" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_EntityRegistrantName"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_a75f3c97-23fc-4869-9f9d-71d0f9d654ee" xlink:to="loc_dei_EntityRegistrantName_fac4c4af-59de-44cf-b47c-524e285e9991" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityIncorporationStateCountryCode_a466eaa8-1883-4e5b-b588-d086acd54086" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_EntityIncorporationStateCountryCode"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_a75f3c97-23fc-4869-9f9d-71d0f9d654ee" xlink:to="loc_dei_EntityIncorporationStateCountryCode_a466eaa8-1883-4e5b-b588-d086acd54086" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityFileNumber_a73776a1-19c0-42fa-bdf1-b0517491f0da" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_EntityFileNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_a75f3c97-23fc-4869-9f9d-71d0f9d654ee" xlink:to="loc_dei_EntityFileNumber_a73776a1-19c0-42fa-bdf1-b0517491f0da" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityTaxIdentificationNumber_d3e0b671-329b-4b3d-bcea-4918d89a9ff5" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_EntityTaxIdentificationNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_a75f3c97-23fc-4869-9f9d-71d0f9d654ee" xlink:to="loc_dei_EntityTaxIdentificationNumber_d3e0b671-329b-4b3d-bcea-4918d89a9ff5" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressAddressLine1_38526739-c69a-4ae2-9adb-66a0e909187b" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_EntityAddressAddressLine1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_a75f3c97-23fc-4869-9f9d-71d0f9d654ee" xlink:to="loc_dei_EntityAddressAddressLine1_38526739-c69a-4ae2-9adb-66a0e909187b" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressCityOrTown_3f2ef551-783b-4571-97a9-d9d48fc1d1b2" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_EntityAddressCityOrTown"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_a75f3c97-23fc-4869-9f9d-71d0f9d654ee" xlink:to="loc_dei_EntityAddressCityOrTown_3f2ef551-783b-4571-97a9-d9d48fc1d1b2" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressStateOrProvince_92dd59f5-5246-42fe-a19c-ce8545483a73" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_EntityAddressStateOrProvince"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_a75f3c97-23fc-4869-9f9d-71d0f9d654ee" xlink:to="loc_dei_EntityAddressStateOrProvince_92dd59f5-5246-42fe-a19c-ce8545483a73" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressPostalZipCode_8e03ce08-0c3b-4f8f-90ae-7edd2cf71be4" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_EntityAddressPostalZipCode"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_a75f3c97-23fc-4869-9f9d-71d0f9d654ee" xlink:to="loc_dei_EntityAddressPostalZipCode_8e03ce08-0c3b-4f8f-90ae-7edd2cf71be4" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_CityAreaCode_976d3ba0-7b29-4a91-ae41-181651fdc7dd" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_CityAreaCode"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_a75f3c97-23fc-4869-9f9d-71d0f9d654ee" xlink:to="loc_dei_CityAreaCode_976d3ba0-7b29-4a91-ae41-181651fdc7dd" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LocalPhoneNumber_b070f983-f917-42e2-baf2-bb2f2504b915" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_LocalPhoneNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_a75f3c97-23fc-4869-9f9d-71d0f9d654ee" xlink:to="loc_dei_LocalPhoneNumber_b070f983-f917-42e2-baf2-bb2f2504b915" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_WrittenCommunications_f382bd46-e6a4-486d-b71f-bf2af1ee286c" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_WrittenCommunications"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_a75f3c97-23fc-4869-9f9d-71d0f9d654ee" xlink:to="loc_dei_WrittenCommunications_f382bd46-e6a4-486d-b71f-bf2af1ee286c" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_SolicitingMaterial_f186dae3-462d-4056-93d4-e4878445474b" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_SolicitingMaterial"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_a75f3c97-23fc-4869-9f9d-71d0f9d654ee" xlink:to="loc_dei_SolicitingMaterial_f186dae3-462d-4056-93d4-e4878445474b" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_PreCommencementTenderOffer_d15d268a-bb38-4e74-80e2-659690ece56b" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_PreCommencementTenderOffer"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_a75f3c97-23fc-4869-9f9d-71d0f9d654ee" xlink:to="loc_dei_PreCommencementTenderOffer_d15d268a-bb38-4e74-80e2-659690ece56b" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_PreCommencementIssuerTenderOffer_7e77529a-b2ee-4c55-849b-89b9a40ececd" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_PreCommencementIssuerTenderOffer"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_a75f3c97-23fc-4869-9f9d-71d0f9d654ee" xlink:to="loc_dei_PreCommencementIssuerTenderOffer_7e77529a-b2ee-4c55-849b-89b9a40ececd" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_Security12bTitle_db54de69-a258-49ce-b31c-fce292f44c95" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_Security12bTitle"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_a75f3c97-23fc-4869-9f9d-71d0f9d654ee" xlink:to="loc_dei_Security12bTitle_db54de69-a258-49ce-b31c-fce292f44c95" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_TradingSymbol_5c9bef61-1a60-44eb-b4e2-01a3f0ba7f0c" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_TradingSymbol"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_a75f3c97-23fc-4869-9f9d-71d0f9d654ee" xlink:to="loc_dei_TradingSymbol_5c9bef61-1a60-44eb-b4e2-01a3f0ba7f0c" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_SecurityExchangeName_e22fad63-5507-4a30-9a12-2fab5ad353ef" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_SecurityExchangeName"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_a75f3c97-23fc-4869-9f9d-71d0f9d654ee" xlink:to="loc_dei_SecurityExchangeName_e22fad63-5507-4a30-9a12-2fab5ad353ef" xlink:type="arc" order="18"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityEmergingGrowthCompany_605e7087-478c-4c1a-b832-a1394fd9af77" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_EntityEmergingGrowthCompany"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_a75f3c97-23fc-4869-9f9d-71d0f9d654ee" xlink:to="loc_dei_EntityEmergingGrowthCompany_605e7087-478c-4c1a-b832-a1394fd9af77" xlink:type="arc" order="19"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityCentralIndexKey_e773fb2c-fd8c-49e2-a5fe-b74accd36d26" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_EntityCentralIndexKey"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_a75f3c97-23fc-4869-9f9d-71d0f9d654ee" xlink:to="loc_dei_EntityCentralIndexKey_e773fb2c-fd8c-49e2-a5fe-b74accd36d26" xlink:type="arc" order="20"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_AmendmentFlag_d2424b1e-4ff0-4c21-90b0-56573ee224a2" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_AmendmentFlag"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_a75f3c97-23fc-4869-9f9d-71d0f9d654ee" xlink:to="loc_dei_AmendmentFlag_d2424b1e-4ff0-4c21-90b0-56573ee224a2" xlink:type="arc" order="21"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntitiesTable_c501097c-dfe4-4268-9f55-78bbbaaf347a" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_EntitiesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_dei_EntityInformationLineItems_a75f3c97-23fc-4869-9f9d-71d0f9d654ee" xlink:to="loc_dei_EntitiesTable_c501097c-dfe4-4268-9f55-78bbbaaf347a" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_d48d6f2a-795b-407a-91f8-95e20d68a8ec" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StatementClassOfStockAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_dei_EntitiesTable_c501097c-dfe4-4268-9f55-78bbbaaf347a" xlink:to="loc_us-gaap_StatementClassOfStockAxis_d48d6f2a-795b-407a-91f8-95e20d68a8ec" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_d48d6f2a-795b-407a-91f8-95e20d68a8ec_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_d48d6f2a-795b-407a-91f8-95e20d68a8ec" xlink:to="loc_us-gaap_ClassOfStockDomain_d48d6f2a-795b-407a-91f8-95e20d68a8ec_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_29c785cf-e969-4ee6-a631-8707abad7f11" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_d48d6f2a-795b-407a-91f8-95e20d68a8ec" xlink:to="loc_us-gaap_ClassOfStockDomain_29c785cf-e969-4ee6-a631-8707abad7f11" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonClassAMember_6a6fa3bd-e5e8-4efb-84e1-432809b6f559" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CommonClassAMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_29c785cf-e969-4ee6-a631-8707abad7f11" xlink:to="loc_us-gaap_CommonClassAMember_6a6fa3bd-e5e8-4efb-84e1-432809b6f559" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WarrantMember_f21b9e71-7384-4324-92da-a36c5e162dbf" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_WarrantMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_29c785cf-e969-4ee6-a631-8707abad7f11" xlink:to="loc_us-gaap_WarrantMember_f21b9e71-7384-4324-92da-a36c5e162dbf" xlink:type="arc" order="1"/>
  </link:definitionLink>
</link:linkbase>
