Coffee Grinder
when a man sits on a woman's face and places his anus on the woman's nose and then proceeds to spin around the face making bits and pieces of fecal matter falling off of the anus landing on the woman's face
Guy 1: Dude, last night I was at this party and totally throwed and decided it would funny to spin around on my ass while sitting on some passed out chicks face!

Guy 2: Dude! That's called a coffee grinder, and that's so damn gross!