A habitual or compulsive involvement in physical exercise in a gym or fitness centre that leads to the detriment of other aspects of the individual's day to day life.
by BijomaruMogami September 1, 2017
When you have not been to the gym for an extended period of time due to laziness or any other poor excuse.
Donnie: Where you been homey, I haven't seen you in ages?
Greg : All this partying is really taking its toll. I have severe gymnesia!
Greg : All this partying is really taking its toll. I have severe gymnesia!
by Gregsands August 22, 2012