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Psoriasis, that skin condition when you get white flakes and red spots on your skin, very commonly on the elbow.
Dude 1: "Lev Avery-Peckinson, why the fuck is there that gross dead skin rash on your left elbow all the time. Is that white boy ash?"

Dude 2: "Fuck you Greg, its my psoriasis, you dick."
by Pimp mastah C March 28, 2014
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