Acronym for "Fucking Old Guy".
That F.O.G. is so damn old he shits himself and doesn't even realize it.
ayon kay Rick Geary ika-09 ng Abril, 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.
ayon kay geoski ika-14 ng Setyembre, 2006
the day after getting really high, and you have a marijuana hang over.

not being all there the next day after consuming a lot of THC
to get over "the fog" exercise, take a warm bath, drink water until you're 100% normal
ayon kay Katlinn ika-05 ng Enero, 2012
Dense; whether its weather or thoughts
He hit me with a fog when i got yelled at man.
ayon kay Cn Clear ika-05 ng Enero, 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..
ayon kay silk manning ika-16 ng Abril, 2009
Flow on the Go. An act of smoking the leaf of the cannabis plant whilst driving down a long and lonesome road.
Hey man, you wanna head down Airport and take a F.O.G.?
ayon kay Nordic Jesus ika-09 ng Oktubre, 2006
Creates an obstructive fog across a scene.
With the use of a Fog and a run through the streets of London, I could hear Farqual cursing behind me.
ayon kay BartimaeusDefs ika-28 ng Oktubre, 2009

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