Sometimes sold at 7 Eleven stores and popularized by Seinfeld. Also, cute and preppy young gay men who summer on Nantucket and prefer to be, well, on top.
After going sailing off the coast of Nantucket, Trent hooked up with Brian who is a total muffintop.
Developed by me and a few friends, muffintop describes the fat that leaks over the top of a chicks pants when she wears jeans that are 2 sizes too small.
MuffinTop: The disgusting amount of flab which one cannot keep holstered within one's pants. Mainly needs a makeshift brace/belt of some sort. See also: Muffin Man; Weightloss; Disgrace to ones bakery.
Overly tight jeans with no excess room. Flab overflowing from top of pants; MuffinTop