Portion of a female (or God forbid a male...) tramp stamp
that rises in a curly fashion out of the top of her rolled-down gym shorts, as if growing out of the dirt in her ass crack. Most commonly observed in the gym where sluts
roll down their shorts to attract attention, or at the beach. The butt weed
has the property of turning an otherwise sexy girl summarily into a piece of trash.
Dude #1: "Bro check that one out. I'd hit that shit"
Dude #2: (turns to look and girl turns around) "Dude, fuck that she's got butt weed."
Dude #1: "Yeah didn't see that. I'm over it."