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Acronym for "Fucking Old Guy".
That F.O.G. is so damn old he shits himself and doesn't even realize it.
F.O.G. by Rick Geary April 15, 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.
F.O.G. by geoski September 14, 2006
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.?
F.O.G. by Nordic Jesus October 9, 2006
-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..
F.O.G. by silk manning April 17, 2009
F.O.G. = Fuck shit up, Order pizza, Go to bed

The motherfucking motto
"No crying, no boys, no drama. We're gonna have a F.O.G. Night."
F.O.G. by jwill_bsu July 23, 2016
F.O.G. = Fuck shit up, Order pizza, Go to bed
F.O.G. by jwill_bsu July 23, 2016