The build-up of dry deodorant.
"My pit butter is like nine inches thick today!"
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."
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