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 24, 2005
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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 July 1, 2006
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"Hey did James pull that girl last night"
"No he just stayed at home knuckle fucking all night"
by Trevor Pike February 19, 2006
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When a guy's dick is soft so he squeezes the base and tries to fuck till its hard. While holding the base he hit's the other person repeatedly with his knuckles.
Well if it goes soft we have to take a break. I hate when a guy tries to knuckle fuck me. I end up with bruses.
by Wonder77 December 25, 2016
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