Face-Ass was coined by LiL' Gang$ta in 1999. It means to act brainless, similar to the word Dumb-Ass.
Person 1: I need another drink
Person 2: Gotta always have a drink Face-Ass
A females heart shaped round but that looks so good you want to smash your face in it.
Damn. She got that smash face ass. Ass so big make you want to smash your face in it.
Face in ass is an act where you hump her to her ass bleeds and then you put your face in her bloody ass and eat her out.
Yo I face in assed Becky last night.