O.G. 

The abbreviation of "original ganster", a term overused by SGs or studio gangsters and millions of people that have never done anything gangsterlike in their life. It no longer a means anything.

Alex:"can I get a discount, I'm a OG, nigga" Cashier: "you're about as OG as Drake ya yesmaster ass nigga, get the fuck out my shop hood rat" O.G.

O.G. by Motheryucker April 11, 2016

o.g. 

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.

o.g. by bob and alpha mu December 19, 1999

O.G. 

Someone That Is an Original Gangsta.
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being an all original gangsta.
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say dude for real-you a real O.G. aint ya?

O.G. by Big D-dallas December 18, 2005

O.G. 

Original Granny- Old ladies of the future with tatoos & listen to rap music.

Our Mom is the O.G.

O.G. by Aunt Wild & Aunt Tess October 6, 2011

O.G. 

O.G. is an acronym standing for ORIGINAL GANGSTER. people and things can be described using O.G. as an adjective. it is almost always associated positivley.

shit, that ninja turtles digital watch is O.G.!

that N.W.A joint is so O.G.

O.G. by 415beez May 31, 2006

O.G. 

any original gangster from any original street gang.

my tio is an o.g. from the west side longos.

O.G. by sisters of the o.g. December 28, 2005

O.G. 

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.

O.G. by HeroicFlow January 29, 2008