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a fart, toot, poot, poof, puff, fluff or whatever else one may call the secretion of gas from the buttox

other examples: anal acoustics, cabbage captivator, talking pants, Victoria Secret's worst nightmare, fumigation
Bob: (round browns) "Aaw that smells! Gary, did you round brown us?"

Gary: "What? HEAVENS NO!"
by Doctor94 January 29, 2011
the ass hole
she loves it up the butt, gonna get me some round brown tonight
by enlightened February 20, 2003