When you have so much piss in your stomach that it actually expands. It is like a beer belly but with piss.
when my teachers wouldn't let me go to the bathroom my stomach expanded and gave me a pissbelly. A piss belly is a stomach expanding because you have so much piss in you
by BigSackedLumberJack October 20, 2015
An unusual and unattractive excessive projection of a female's lower abdomen. Most common in females over forty years of age. Stomach area above the Piss Belly generally remains relatively unaffected.
by PopeMichael July 21, 2009