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When a fart smells and sounds like diarrhea.
Mike: *blarp*
Bill: That was the most diarreastic fart I've ever heard!
by PocketCalculator April 17, 2014
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2
When a fart is so bad, it sounds like somebody just had plopped out diarrhea into their pants.
Mike: *plbbbbbbbbbbbbp*
Frank: Jesus Christ, that was the most diarreastic fart I've ever heard.
by CrackThatWhip March 18, 2014
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