copaset Share definition Flag Verb - derived from the adj. copacetic. To satisfactorily co-exist with an ex in order to not cause undo drama or pursue another in their presence and them being "ok" with it. We were like 4 years ago, please copaset tonight so I can crush her. copaset by 1funday July 24, 2009 0 0 Get merch Get the copaset mug. Buy Now — $32.95 See more merch