The phenomena of how seemingly normal panties instantly become heavier when worn by a slutty girl.
The added weight tends to causes panties to drop at a faster speed.
"How much do think Kim's micro thong weighs?"
"At least 3 lbs, maybe 7 by the time the frat boys come over later"
"Yeah, I just hope her heavy panties don't make a loud *thud* when they hit her bedroom floor like last night"
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Slang for "You shit your pants so fucking bad the shit is dripping from your leg"
Awe my little Heavy Panty! *sucks the shit out*