A greasy ass hamburger that causes diarrhea. Particular burgers that are eaten at late-night restaurants after you have just come from the club/bar after a night of drinking.
Man them White Castles are a certified Gut Burger; I just couldn't stop shittin the whole morning.
when your gut feeling tells you to do something, but your head tells you not to do it. May also be applied to choices.
Brian, John, Lance and Max are deciding where to go. They give Max the choices because he is the youngest one here. He has to pick.
Brian: Max, would you like to go to Taco Bell, Arby's, In-and-Out, the diner or McDonald's?
Max: uhhhhhhhhhhhhhhh(this goes on for 30 minutes)
John: Guys, he's having a gut bugger. In-and-Out it is!