Yak Butt

Someone with a large ass approximately the size of a Yak.

Dude, that ckicks Yak Butt almost tuched me.

by Kevin May 1, 2006

Butt-yak

VERB, An expulsion of flatus during a bowel movement that is powerful enough to throw a heavy spatter of semi-liquid feces in a muddy spraypaint fashion.

I butt-yakked so hard that I got some on the seat!

by The West Side Smasher April 24, 2003