The act of "grinding" or "twerking," except in the case if stimping, the male penis actually goes into the butt hole of the person they are dancing with. This is hands down the nastiest, kinkiest, rudest and quite frankly the best way to get freaky in da club.
Guy 1:"Damn bro you see how hard Laura was getting stimped at the twerkfest last night? I would so stimp the shit out of her."
Guy 2:"Yea man she's got the asshole of a goddess and she loves getting stimped."
Guy:"Sup beb wanna stimp?"
Girl:"No way Jose, that shit is too hardcore for me."