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When you have diarehha to the point its shooting out your butt
Im sick and i have mass river butt
by Fodrizzle01 May 31, 2016
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When you've drank too much alcohol the night before, then the next day you have constant diarrhea.
Joe- Hey do you want to go see a movie?

Sam- Oh man, I would but I have an extreme case of riverbutt right now.
by Lethal Lindsey August 01, 2016
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