The term 'protuberant belly' is often used to describe a PAUNCH, which is an abdominal protrusion caused by excess fat or fluid in the abdomen. It is also known as a beer belly, potbelly, or spare tire. A protuberant belly can be caused by a variety of factors, including poor diet, lack of exercise, and genetics. It can lead to health problems such as heart disease, diabetes, and high blood pressure.