O G 

O G means original gangsta
those tru gangstas from way back in the day that jacked ya and left nothing but you boxers and socks

Biggie and tupac were both OG's

O G by James White July 10, 2004

O G 

This peculiar word can be used to describe a "hard" playa from the streets who is pimped out and smooth. O G stands for Old Gangsta or Original Gangsta.

"I keep it real on the streets, I'm a real O.G."
-T.I.

O G by Fuck Nigga June 13, 2005

o g 

the original gangsterz from the hood way back.
NOT GAME, 50 CENT OR G-UNIT.

OG is refering to the pioneers of gangster rap who were in it since the beginning such as Dr Dre, Ice Cube and the late Eazy-E (RIP)

"I stab it like a true no good nigga
should,I do it the way a down OG nigga would" - Eazy E; "still a nigga"

o g by Narvin Singh Sondh aka Slick Singh December 31, 2005

O G 

A hybrid strain of Of potent marijuana. Often called OG Kush, but O G is Sativa dominant.

If your looking for dank O G, go to the Valley.

O G by tirdbergler August 15, 2008

o g 

Olive Garden - an American Institution

Let's go to the o g.

o g by girly girl 123 November 13, 2010

O G 

Old Girl originated in Chicago/Midwest meaning your moms or mother.

i.e. "Can I come over to your crib? Only if my O G ain't home."

O G by S.I.R.E. December 1, 2007

O G 

a older gang member that has been in his gang for 20years or more who may not b active in gangbangin
O G "ORIGANAL GANGSTA"

YG 1- "cuz tokkie was a real TRIPLE O G"
YG 2-"fukk ya dat nigga was tha O G ov O Gz"

O G by D-boi April 22, 2007