knuckles down

Sly way of saying jerking off.

I was knuckles down crushin my beef.

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knuckled down

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)

Knuckle Down

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!!!

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beef knuckle beat down

to have sex

Remember that girl from biology class? I totally gave her the ol' beef knuckle beat down.

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