The act of snapping off an unwanted penis when it is inserted into one's asshole by locking up the ass muscles and simultaneously jerking your hips to the side to effectively disengage the unwanted party's member.
a particularly largeperson with a very flabby butt. when they do butt exercises next to walls their butt tends to swing and reck the wall they are next to.
dang it wall recka! there goes another wall.... :T