When massive diarrhea occurs, it is the spray that hits the water and bounces back and stick to the butt.
It comes from an old backcountry saying about animal droppings, mostly the consistency.
"After drinking a quart of hot sauce, I ran into the bathroom to release the massive diarrhea build-up and got poopykapoop all over my butt. I forgot to wipe it off and it felt gross against my pants."
by Cedar January 11, 2005
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