- 1. that's what's up (idiomatic, slang) Used to express acquiescence or concurrence. Source: ecdict
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that's what's up
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thankworthythartharmstharosTharpthat and a dollar will get you a cup of coffeethat girlsthat is to saythat-clausesthatchthatch palmthatch treethatchedthatched roofthatcherThatcherismThatcheriteThatcherites
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