When someone at the gym drops a load of weights suddenly, usually in a machine, causing a deafening sound to occur. A common phenomenon and most people try to act like they are not bothered.
I don't know if that guy is trying really hard or just being annoying because that was some serious gym thunder.
by Bonzai_ February 7, 2015
Get the Gym Thunder mug.Related Words
Gym Thunder
• gym
• gym teacher
• gym class
• Gym Meet
• gym bunny
• gym sock
• gym class hero
• gym class heroes
• Gym Dick