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The sweat that gets in-between your butt cheeks and causes your underwear/bikini to become moist.
"Dude, it's so hot today. I'm totally getting a bikini drip."

Person 1: "Did you pee your pants?"

Person 2: "No, it's just real hot today. I'm getting a bikini drip."
by M-Dog or Captain Morgan July 19, 2008
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