thunder gut

the enormous gut of an obese person that produces thunderous sounds when it smacks against itself.

yo man do you see that obese person?
ya man she has a dirty thunder gut.

gut thunder

The sudden, uncomfortable, and uncontrollably audible rumble emanating from the abdominal region, usually signaling the imminence of a trip to the toilet. Can be disturbing to others, and very embarrassing for the afflicted party. Not to be confused with gut storm, which usually follows or accompanies gut thunder.

All through the presentation, someone in the back row had a mad case of gut thunder and made it difficult for anyone else to enjoy the show.