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2.
Slang term in the metro st. louis/illinois area that refers to something in Belleville; a Belleville hot spot or scene.
Tonight we're going "belly-up" at the Belleville skate park.
by Baby Face Jonas August 30, 2007
 
1.
Dead. This comes from how fish float up to the surface "belly up" when they die
one of my goldfish went belly up last night, now I have to flush it.
by butterfly on the wall January 12, 2010