Much like a butterface, a buttergut is a chick with a cute face and rack; the deal breaker is the sloppy flab of skin that hangs over the beltline (commonly refered to as a fopa, ponchor gunt).
Damn bro, I was all about the rack until I saw her ponch. Goddamn Butterguts!
See fopa, gunt, butterface, belly, stomach, muffin top, obese, sloppy