(1) To stunt or floss refers to when someone tries to show off. So when stunting - you are trying to impress and show all you got.
(2) To take a mean shit - we're talking a few courtesy flushes and aint nobody going near that bathroom for atleast two hours.
(1) "Say homie, we're trying to have a good time and here you come rollin' up in this bitch trying to stunt like you hot - whats the damn deal?"
(2) "Oh damn man, you don't want to go in there Jerrod was in there for an hour stunting and I could smell it from across the house. Trust me, dude - just go outside"