Something the men are magically forced to stare at and slap
Look at that ass *the person they are staring at turns around. you look up* holy shit those are some big tits. *They ask you if you want to go back to her car and have some "fun"* you say yes.
The thing you say to describe something really, really cool.
“Duuude...that party was so ass!”
“Hell yeah man, it was ass AF”