The act of fornication between a man and woman. The fornication must take place in a bathroom of a bar, near a sink which has recently been used as a receptacle for vomit. The man will "hit it from behind" while the woman eats the vomit from said sink.
The woman is the "bafflee" and the man is the "baffler."
"Did you see what's going on in the bathroom?"
"Yeah, they are totally doing the Alabama Ass Baffle!"