When you are working out and you have excessive moisture in your ass. Irritation from sweat in and around your buttocks.
I have the worst case of GYM ASS from working out today. Sitting at this desk gave me a case of Gym Ass.
by Big Man Certified February 28, 2019
Some kind of brotha or sista who spend three hours in the gym, stacks on five workouts, and drives the coaches insane.
by Get PUMPED!!! August 22, 2020