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When you're sitting on a stool at a crowded bar and people pass by you and your knee ends up either in their crotch or ass.
1: Yo I just knee fucked that chick with the big ass. She was wearing a fucking thong too.
2: Aw shit man, I just keep knee fucking the scrote.
by Fo Sheezy My Yeezy Breezy August 13, 2011
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