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The month at the begining of the year (usually lasting no more then two weeks) that sees a rush to get in shape by people making resolutions they can't keep.
Workout guy 1: "Who are all these new people?"

Workout guy 2: "It's Gymuary, they'll be gone in a few weeks"
Gymuary by Teaching Master January 27, 2009

Gymuendo 

An innuendo or double entendre heard at or relating to the gym.
Person on rowing machine 1: It's sometimes hard to make yourself come, but you're always glad once you've done it!
Person on rowing machine 2: Wow, what a great gymuendo!
Gymuendo by Darklight Angel April 25, 2011
Means large or big or a large group off people
That person is gymungus.
Gymungus by Joe Koenig October 23, 2006
The gymungo whale swam throughout the ocean making some very strange noises.
gymungo by Katlyn Brown December 31, 2008

gymudjymeraffk,rflhwf,khefre 

When you fall asleep at the keys
gymudjymeraffk,rflhwf,khefre
Get your money up not your funny up
gymunyfu
gymunyfu by negaaaaa March 24, 2023