To take the edge of your hand and proceed to swipe it like a credit card in the ass crack of an unsuspecting victim
He got butt-sliced so hard it lifted his feet off the ground.
by AOKist August 28, 2005
the fine use of martial arts to strategically place a knife edge hand swipe as far up someones ass as possible
I was going up the stairs and Dan Bob butt sliced me so hard I could taste my underwear.
by Palokuku July 29, 2008