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3.
OSG
Old School Gamer (or Old Skool Gamer)
a Person who prefers old Games instead of new games
basically another word for retrogamer that was originated in a Dirty South Killa Song where he mentioned many Sega and Nes Games.
MAN1:"what are you playing"
MAN2:"super mario bros"
MAN1:"oh an OSG classic"
MAN2:"I am OSG so I love these kinds of games"
by JD West May 06, 2008
 
1.
osg
A commonly used catchphrase by Southern California queens, especially Hillcrest betches meaning "Oh Shit Girl."

This abbreve (abbrebiation) has also made its way onto many t-shirts and is funniest when used with a very girly man or woman.
Did you see that fired-ass tranny walking across the street?

"OSG"
by ParisFired January 05, 2010
 
2.
OSG
original stoner group. The original group of people you started smoking with. Coined in the Bay Area, if you know it, your in.
Mark: Hey man want to hang out?
Jake: Can't, hanging with the OSG tonite...
Mark: Damn, wish I had one.
by JTKL January 08, 2013