black knees

Black knees belong to women who meet random strangers in places of gathering (i.e. restaurant or nightclub) and proceed to give them blowjobs.

Jenny: She was blowing some dude in the bathroom at the club.
Mike: Explains why she in the club with a white dress and black knees.

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black knees

The characteristic discolouration of the patella of black women. The colour is literally black, in contrast to their skin pigmentation, which, as we all know, is actually brown.

"Why have you got de black knees, mon?"

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slapping the black man's knee

To masturbate vigorously.

Friend 1 : "Hey, why weren't you out last night?"
Friend 2: "Sorry, I was slapping the Black Man's knee.

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