Gut fart
A loud, long fart as if it was coming deep from your gut, often may feel like you have to shit but only air comes out, followed by a feeling of relief.
Mathew thought he had to take a shit but when he sat on the toilet he passed a huge gut fart.
fart guts
A pet name for the stomach
Lloyd: "Did you try that chili?"
McKenna: "Yeah, but now my fart guts hurt."
McKenna: "Yeah, but now my fart guts hurt."