When your stomach is so pudgie that the bottom part of your stomach forms a lower case "w" shape making it look like a butt.
"Ew, look how gross that girl's stomach butt is."

"She's so pudgie she has a stomach butt"
by Mellow Jello January 8, 2014
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When your stomach looks like a butt and you can't see your private parts until you lift it.
Her Bujumic(butt looking stomach)is so big, she has no lap.
by CynJay March 13, 2008
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