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All above answers are incorrect. It stands for "Fuck me gently".
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by jd7x7 May 18, 2011
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2
fmg means fuck my grandma and is used in the same way as OMG ( oh my god!) as in surprised!
person 1:he dumped me for her....
Person 2: FMG.... yur joking
person 1: naoooo :(
by FMG-maker July 28, 2010
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3
FMG stands for Fuck My Generation. It's used by people that hate living in this society of morons.
Daiquan:"yolo..swags...man dats beat"

Borris:"Man what's society coming to? What a shitdick!"
John:"Idk dude. FMG."
by Melvin Mapes June 17, 2013
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4
Fat Man Goatee. The facial hair style chosen by larger men who want to define where their chin should be.
Dude is so overweight, he had to grow a FMG so you can tell which one is his jawline.
by Lose 80 Pounds June 03, 2010
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Like when you're getting it on and into it and say "fuck me good!", same application for FMG when talking dirty over the net or while txting.
by nOneXs!SteNT December 03, 2010
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6
To have smeat; small meat; undersized penis
Guy: I heard miles is an FMG, sounds harsh

Girl: yea I didn't know it was in until he told me he finished
by Gilymantech March 21, 2016
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7
Short for "Fuck My Game". Typically used when your playing a game and your losing, doing poorly or just plain sucking. Usually only multiplayer games and your kill/death ratio is negative.
Fuck that is the fifth times hes killed me in a row, FMG!
by Canadarocker February 27, 2010
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