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!
A big juicy hamburger (or any burger you crave).
I'm hungry, lets get a gutbomb!