A catchphrase; Also know as a comback in an argument; dats wats up is also known as that's what's up written in ghetto form
Catchphrase:
Person 1. "I aced the test"
Person 2. "so did I !!!!!! Dats wats up"

Comback:
Person 1. "Your ulgy thats why you have no friends"
Person 2. "At least I'm a prettier version of you, dats wats up"
by zebra0028 April 15, 2015
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