Where does “whatcha” come from?

whatcha (English) comes from English what, from Middle English what, from Old English hwæt, from Old English -ing, from Old English -tūn, from Old English tūn, from Proto-West Germanic tūn, from Proto-Germanic tūną — smoke; mist, haze.

Ancestry of “whatcha”, step by step

StepLanguageWordMeaning
1EnglishwhatWhich thing, event, circumstance, etc.: used...
2Middle Englishwhatwhat
3Old Englishhwætwhat; why; how many or how much
4Old English-ingForming nouns from verbs, indicating action,...
5Old English-tūnhomestead, village, town
6Old Englishtūnenclosure, yard; place; dwelling
7Proto-West Germanictūnfence
8Proto-Germanictūnąfence; enclosure
9Gaulishdunumfort; hill, hillfort
10Proto-Celticdūnomstronghold, rampart
11Proto-Indo-Europeandʰewh₂-smoke; mist, haze

Words derived from “whatcha

Every word from Proto-Indo-European dʰewh₂-
whatcha — Etymology, Origin & Word History | Etymology Explorer