Very large mass of fat that gathers in the lower abdomen primarily but not recticted to fat women. See also fupa, front butt, or gunt. Men also can suffer from this condition although men traditionally of this size tend to wear a fat apron.
The lady at the China Buffet had a ginourmous crotch belly.
Big fat Roy is a man with a huge crotch belly. He really likes cheese and garlic butter.