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50.
Commonly misunderstood as a term which stands for "Original Gangster," this versatile phrase (and it IS a phrase) actually means "Original Garvey," referring, of course, to Marcus Garvey- both the national hero of Jamaica and the founder of Pan-African activism later dubbed "Garveyism." The term "O.G." is used to describe a situation, object, or person who is slick, fortunate, above par, or of course, original. In essence, having resemblance or similarities to Garvey himself. (the Rastafarian Movement considers him a prophet)
Dead Prez: "This shit is O.G. This shit is O.G. Original Garvey Nigga!"

Dude #1: What happened to Kwaze-Murder after them jakes started shooting at'em?
Dude #2: nah. Kwaze straight-up pulled out the semi and blasted every which one of them lil' piglets.
Dude #1: That shit is O.G.
by HeroicFlow January 29, 2008
 
1.
OG
Original gangster
someone who has been around, old school gangster
by Levdog February 14, 2004
 
2.
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
by James White July 10, 2004
 
3.
OG
original gangster. Being, or being related to the stereotypical 1970's gangster's lifestyle
OG Loc, Keepin it Gangsta!
by Doctor of the Mix January 30, 2005
 
4.
o.g. : original gangsta

a retired gangster who sits on the porch in the ghetto and preaches to the youngsters.
the o.g. showed me how to keep my own.
by bob and alpha mu December 19, 1999
 
5.
OG
Jay-Z's imaginary friend.
Catch me at the X with OG at a Yankee game.
by Tikibarberfan March 06, 2010
 
6.
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"
by Narvin Singh Sondh aka Slick Singh December 31, 2005
 
7.
OG
Orangutan Ganja - Really strong weed that Asian Orangutans smoked with Budda. Now used as a marketing term universal adjective that has largely lost its original meaning. Used to describe strong weed (i.e., OG Kush, OG Sativa, OG Indica, etc.).
Hey, I got some OG at the dispensary.
This stuff is real Orangutan Ganja.
by Jack Meough March 15, 2010