"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.
por Not A FOG 19 de Outubro de 2010
fuckable older guy
Man look at him, he might be 40 but he's still a F.O.G.
por FOGlover 29 de Novembro de 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!
por jetsetterwantabe 07 de Maio de 2015
Acronym for "Fucking Old Guy".
That F.O.G. is so damn old he shits himself and doesn't even realize it.
por Rick Geary 09 de Abril de 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.
por geoski 14 de Setembro de 2006
Dense; whether its weather or thoughts
He hit me with a fog when i got yelled at man.
por Cn Clear 05 de Janeiro de 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..
por silk manning 16 de Abril de 2009

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