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1.
First Online Game Syndrome.
Thinking that Everyquest was the best MMO to date. Similarly, thinking that CS 1.6 is better than modern shooters and CS:S was a pile of shit.

Young gamer: "Modern Warfare 2 is the best call of duty, Black Ops and Modern Warfare 3 are shit"

Wise gamer: "You have a huge case of F.O.G.S."
by MisterMartinez October 14, 2011
 
2.
Fans Of Garden State. The movie starring Zach Braff and Natalie Portman. It is used by indie wannabees to describe themselves.
I'm a F.O.G.S. see how cool i am?
by Tyler April 16, 2005