When you go to the gym and get temporarily get bigger after your workout, just to go back to your normal size.
You (post gym): "man I'm so pumped after that workout, I'm freaking huge!"

Your body: "you just have the post gym pump. This is what you could look like, but... you won't actually look like that in about 30 min"
by Tuckleberry August 30, 2019
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This term is used to describe the act of performing cunnilingus and/or intercourse after the female has come home from the gym and before she showers. The sweaty female vagina enhances the flavor and the release of endorphins after exercise by the woman increases the joy of sweaty sex. Though it should be noted that a vagina must be clean first prior to getting sweaty from a heavy workout.
"I was so horny we did it post gym pre shower. It was delicious."

Guy: You look so hot I want you now!
Girl: I'm all sweaty from the gym
Guy: Post gym pre shower baby.
by Dee Jay Jolt March 30, 2010
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1.) place to exercise on a military base
2.) place to loiter after working out
1.) "I'm heading over to the post gym at lunch"
2.) "Do they have the same things at Post gym that they have at the Après ski?"
by dcskeeler October 19, 2007
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