To violently finger fuck a girl or to ultimately become knuckle deep in her vagina while furiously finger fucking.
Dude! I was knuckle beefing that girl from the party last night so hard.
by blowjobjack December 28, 2019
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A) To fist an asshole. (verb)
B) something that is unpleasant (noun)
"Dude I gave her some serious knuckle-beef last night"

"Man, that test was some major Knuckle-Beef"
by Jomofo April 24, 2012
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I had a beef knuckle in the showers after football
by Brad Hull November 18, 2006
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When a girl has her pants pulled way up, and you can see the outline of her beef curtain.
Dylan: Did you hear that Hunter fucked Kassie?

Kody: Ewww, she has beef knuckles.
by DildoNelson April 12, 2010
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Remember that girl from biology class? I totally gave her the ol' beef knuckle beat down.
by long strongrod December 07, 2010
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When your balls are stuck in skinny jeans.
Man, I had some serious Beef Knuckle going on in my skinny jeans last night at the show.
by jakha290 October 18, 2019
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