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1.
Synonym for diarrhea.

n.
Excessive and frequent evacuation of watery feces, usually indicating gastrointestinal distress or disorder.
Mom, can I come home? I got soupy poopy in the girl's bed!
by KaylaCatCut December 05, 2008
 
2.
A cooler way of saying diarrhea. It's how all the kids are doing it these days. They eat castor oil to fit in with their peers.
Damn, kid, I know you wants to be cool and all, but that be some soupy poopy.
by MShinners December 12, 2008