Nickname of a a flatmate christened Imogen in response to her spending increasingly longer and unexplained periods at the gym.

A portmanteau of Gym (abbreviation of Gymnasium) and Imogen.
#1 Sam: Hey where's Imogen?

Jakob: Probably at the gym.

Sam: Classic Gymogen.

#2
Imogen: Hey guys, sorry I'm late. I was in the gym.

Flatmates in unison: Gymogen!

#3

Sam: Where's Gymogen?

Imogen: (walking in) I've been in the pool all day.

Sam: Maybe we should call you Swimogen!

(Awkward silence ensues)
by Cousin Roxburgh December 02, 2012

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