(Noun); 'Fhruntal but'; American English. It's is the protrusion on a man or woman in the groin area on an extremely obese person, where their genitalia looks like it should be. The chunk of fat that looks like an ass in the front of an obese person that defies where and how they can find their junk under that mud flap. Found typically at Walmart without problems.
1. Oh my god! Look at size of that frontal butt, she'll never find her pussy under that thing.
by Alexander Filatov July 04, 2014