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When you go take a dumb/crap/shit and your shit hits the water hard enough so the water ends up going up and the water touches your ass.
Bob: Well my day is ruined!
Jack: Why?
Bob: I had reverse diarrhea
Jack: wtf is that?
Bob: Its when you go shit and your shit lands in the water really hard and the water splashes against your ass.
by Junsquared December 29, 2011
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