to physically beat someone down with your fists
"...there's a good chance ya ass is either gon' get shot, stabbed, or knuckled down, one out of the three." - Prodigy of Mobb Deep (The Infamous Prelude)
by GSTWN May 13, 2007
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To have a firm grip on ones cock and sucking them off with your knuckle's bulging out of your hand to show your hard work.
Heather popped a vein in her hand after she knuckled down hard on Mikie!!!
by Insane V April 2, 2004
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Remember that girl from biology class? I totally gave her the ol' beef knuckle beat down.
by long strongrod December 7, 2010
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