A usually very tasty super-sized fast food or greasy spoon diner food item that, when ingested, immediately explodes in your gut, decimating your stomach lining. The item usually has a very short (but painful) residence time in your digestive tract before performing a rapid exit to the outside world, and being released back into the wild (e.g., the toilet).
Phil: I'm going to Estelle's for one of those triple decker gut bombs with peanut butter and bacon toppings.
Wayne: Three hamburger patties? Donno if my stomach can handle that at my age? For chrissakes, I'm lucky if I can down a single.
Phil: But you have to go for it, it's the ultimate gut bomb, and you only live once!
by Whitey803 October 28, 2012
A big juicy hamburger (Usually with all extras). NOT usually applied to chain fast food; But rather, ma-and-pa kinda establishments.

My grandfather made this word famous in our family, I'm 3rd generation using this word. When my daughter is old enough for a roadtrip, I'll teach her this word.
I'm starvin! Lets go find us a gutbomb!
That gutbomb hit the spot, I'm good for another 300 miles!
by 216 January 13, 2007
A big juicy hamburger (or any burger you crave).
I'm hungry, lets get a gutbomb!
by 216 January 10, 2007
A coney dog or chili dog, LOADED! Occasionally misused to also describe one of them bite sized late-night "greezy spoon" hamburgers with grilled onions, which technically is known as a "slider."
After the bar closes let's stop on the way home and get a six-pack of gut bombs.
by gumby April 16, 2003

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