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When you enter a public bathroom to see a hostile black man vigorously trying to take a shit. Probably constipated, displaying a tensed, fist pumping action. Veins visible.

WARNING: Very dangerous. Do NOT approach.
Cameron: "Hey, did you see Jamal on the toilet today? Scary stuff man."

James: "Oh I hear ya, what a Stall Nigger."
by Stall Nigga February 26, 2011