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The makeup typically used by female dance artists to cover imperfections on their buttocks. Also see Clown Crotch.
Ginger, "Candy, do you have anymore ass makeup for me? My butt is feeling extra pimply today."

Candy, "Sorry, I'm all out. I've been killing it today. Haven't you seen all the clown crotch walking around out there?"
by EsteeLauder April 03, 2011