Urban Dictionary: Definitions by HAHA KYLE H. COLIN B. DID THIS

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knee grinder

Boobs or "tits" that sag so far they slap against the persons knees.

Dude check out that grandma shes totally got knee grinders!

by HAHA KYLE H. COLIN B. DID THIS December 13, 2010

Get the knee grindermug.

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