its not punching, its when you fuck someone hard in the face....with your knuckles
johnny t-bagged my roommate and then left with the pizza so when he came back looking to borrow some money, i knuckle fucked the shit out of his face
by diego delavega June 30, 2006
One who combines the attributes of a knucklehead and a fucker.
What the hell! Are you some kinda knucklefuck?
by David Nygaard January 30, 2005
A term used to describe a person who is a general dumb-ass.
"Ernest is a real knuckle fuck" or "What a fucking knuckle fuck"
by nutsmell March 23, 2005
to put it simply, fisting.
i knuckle fucked three chicks and a dude last night.
by holla at yall July 27, 2009
to punch or hit, especially in anger.
Im gonna knucklefuck you if you dont shut the hell up!
by omegavolt June 09, 2003
The act of sexy punching (fisting).
Margaret, come here. I wish to give you a knuckle-fuck
by L1feLus7 December 03, 2009