look up any word, like blumpkin:
 
1.
Belly pooch, bloated gut, intestinal bloat, the bloaties, when your gut sticks out more than your butt does
My stomach is so bloated it is sticking out a mile, I have gut butt
by Chinacat 1967 August 30, 2006
 
2.
When someone has gained so much weight that when they laugh their stomach claps harder than their hands do.
"OK bro, your belly just blinked at me..you're really gonna have to lose weight cause your Gut-Butt is getting out of control.
by The Penguin Gazette October 11, 2011