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Go Fuck Your Mother! Also know as "The four words guaranteed to start a fight!" Use it when everyday insults, just won't do! Very much like GFY, only better.
Hey Johnny, Go Fuck Your Mother! Or just GFYM
GFYM by Rosslyn Maleman January 8, 2008
Related Words
GFYMF gfym GFYF Gymfag Gymflation gfomf gfyfer GFYOF gfyyfc GFYYFF

Gymfiltrating 

Infiltrating a gym, most likely as an under cover cop
The police caught the smuggler thanks to the work of two undercover detectives, who were gymfiltrating the smuggler's gang
Gymfie is a selfie taken through mirror at the gym. People try to show their fitness: men their biceps and women their asses.
"Did you see Kim Kardashian's new gymfie?

Haha yeah, her ass was soooo photoshopped!"
gymfie by Shift happens January 26, 2014

gymfluence 

The capacity or power of a person to convince you to go to the gym, or more commonly to crap out and not go.
We joined the gym together, but it turns out she's a bad gymfluence and we never go.

She told me she'd rather go for a drink than go to the gym. She's such a bad gymfluence.
gymfluence by Tee-bag May 23, 2008
Short for: Go Fuck Your Fist

Or to tell some to msterbate.
Frank told Hunter to "GFYF", she cried.

"GFYF you prick!"

Sorry I did not get the phone, I was fucking my fist.
GFYF by FKIV August 4, 2006
An extremely muscular male adult who obsesses over his body more than most 16 year girls.
"I think that dude's about to cave in your skull!" "Who cares? He's a fucking Gymfag."
Gymfag by Lesbiantics November 5, 2011