short for Guardian Force, a summoned creature that can be "compatible" and used for junctioning magic and skills
Shiva, Ifrit, Siren, Tonberry, Eden, Bahamut, Diablos, etc..

"With the GF, I junctioned 100 Ultima spells to my attack. Prepared to be pwn3d!"
by Shroudie April 12, 2004
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Acronym: Global Forecast System. Probably the best weather forecast model available to the public at present.
Have you seen the latest GFS models?? Looking like major snowfall for next week!!!
by brendan May 30, 2004
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Simply a girl that's your friend, nothing more.
by LilMeatBeater July 21, 2019
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Garrison Forest School. Renown Private All-Girls School in Maryland. Starting at 3 year olds and going up to 12th grade. College Prep School
Public School Kid:Oh you went to GFS? So does that mean you're a dyke?

Garrison Girl: No, it means that I'm smarter and have more money than you!
by Honery1 February 25, 2009
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Person 1: I'm sad.
Person 2: You know what you need? A GF (good fuck).

Also: That Dan, hes such a GF.
by BDT November 24, 2004
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shorthand for grandfather, the mighty sword in Diablo LoD
Bryan: Hey dude ive jus got a 250% GF
John: kewl, can i try it on my barb?
by VowOfSilence April 9, 2005
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