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Something that is the antithesis of sexy, ugliness/unsightliness personified, the appearance of which literally makes an average male's scrotal sack pucker up while his testicles retract.
"Dude, Heidi Montag thinks she's hot shit, but in reality she's the most ball puckering slore I've ever seen."
by D. D. Flummox April 16, 2010