90s rappers often mentioned drop top BMs, commonly believed to refer to BMW convertibles. In reality they were talking about taking their long ass shirts off when thet had to take a poo, so they didn't poo on their fresh, white tees.
Drop top BMs
"Yo, those burritos were hot! Hold my shirt bro, I gotta go take a drop top bm."
by SpeedW124 January 11, 2018
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