This is someone that is too stupid to be a Jackoff.
Biff is such a Knuckle Fucker, he can't get anything right!
by JZ Blozzini February 29, 2008
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1. Slang term used for any male douchebag who is rude, disrespectful, belligerent, violent, angst-filled or otherwise aggravating on account of the fact that he can't get laid.

2. Any young male whose only real use is pumping protein samples into socks or garbage pails.

3. A griefer in an MMO.
1. "Hey knuckle fucker, sit down and shut the hell up, and stop making a scene because you're a limp-dicked little douchebag that couldn't get his dick wet if he jumped in a fucking lake."

2. Tuef, Bum, Toneslice, Noobslice, etc.

3. "I'm trying to get my gear fixed but there's some knuckle fucker spawn camping the repair guy." Also see #2.
by JustAnotherGuy July 11, 2008
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One who graps his penis with his hands in a white knuckle grip and vigorously jacks his cock off.
by French Admin Guy July 26, 2007
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A large black dildo (around 8-10 inches) attached to a pair of plastic brass knuckles (also black) to give pleasure to anything that lives. Offered by Dylan Godfrey from "The Sales Company" for a very good price.
Excuse me, Excuse Me
My name's Dylan Godfrey, I'm with the sales company
I was wondering if you'd be interested in buying one of our products...
What you're looking at here is a Knuckle Fucker 5000, it's good for pleasure, lot's of force to it so uh I don't know you might enjoy it
Hello, hey? Are you interested in buying one of these?
Nope, nope alright well then have a good day!
by Caleb_DeBrusk September 10, 2020
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In the game of marbles, the positioning of the clenched hand, with the thumb inverted into the clenched fingers, which propels a marble toward the target group of marbles. So called because of the hand resembling the common masturbation technique utilized by men, and because of the thumbs insertion into the "hole" resulting from the clenched position of the hand and fingers.
When I was a shorty, I was the Fucker Knuckle champion of the block.
by ken taylor January 3, 2005
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