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.
by Bada Bing, Bada Boom October 31, 2013