The area of the stomach where an irregular amount of fat is stored. The area is not only carrying too much fat, but the fat is so abnormally differnet shaped that it flows over the pants/shorts etc. to form a sort of front muffin top.
David: Oh man look at the guys stomach! It's flowing out of the bottom of his shirt
Ben:Dude thats gross
David: No, thats a moncho-ponch!