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1.
The feeling of ecstasy one feels after completing a fulfilling meal of soup, making one completely relaxed.
I'm staying in tonight, I have Soup Belly and I'm good to go.
by Fitty4ex June 18, 2007
 
2.
A stomach that has a belly button large enough to eat a can of soup out of. Obviously derrogatory towards fat people.
AKA-Campbell's Chunky
Look at that soup belly.
by racingsmythe29 May 16, 2009