This one goes way back, probably to New England Yankees. It actually means someone with an inflated opinion of himself who lets the world know about it--a windbag. It also has an undertone of meaning someone who's basically an unworthy lazy slug. Not a pretty picture!
The abdominal frontal protuberance characteristic of excessive drinkers of beer and food gorging.
pusgut beaj baconeatingatheistjew.blogspot.com judeophobewatch.blogspot.com is known to be a non working slob that rarely leaves the house. His fridge door slams open and closed like a screen door in a March wind. He is morbidly obese with a typical pusgut.