"fresh out of grade school." Basically, a grade nine, or when someone acts immature. It is interchangeable with the term "niner" only FOG is more fun to say...
-(Let's say Jill is acting immature), One may say, Jill is so FOG.

- All the guys on the rugby team are FOG.
av Not A FOG 19 oktober 2010
fuckable older guy
Man look at him, he might be 40 but he's still a F.O.G.
av FOGlover 29 november 2009
Creating your own Cloud to store your data in your house so that your data is in your control and not out in the Cloud.
Get your data out of the Cloud and create some Fog!
av jetsetterwantabe 7 maj 2015
Acronym for "Fucking Old Guy".
That F.O.G. is so damn old he shits himself and doesn't even realize it.
av Rick Geary 9 april 2007
Fly Over Gruntsquat
best performed with pre-jizz already leaking out and someone you may or may not like is passed out on their back.

work up to pre-jizz...
Fly Over Gruntsquat 'em.
pics are always handy.
again, follow the directions
F.O.G. someone this weekend....they'll love you for it.
av geoski 14 september 2006
Dense; whether its weather or thoughts
He hit me with a fog when i got yelled at man.
av Cn Clear 5 januari 2011
Def: Friend Of Girl
-Damn Spitz, you gonna rail her or what?
"Nah man I'm just gonna take her home. She's had too much to drink."
-Stop being such a F.O.G..
av silk manning 16 april 2009

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