o.g. : original gangsta

a retired gangster who sits on the porch in the ghetto and preaches to the youngsters.

an O.G. is a Orginal (old) Gangsta who let all tha up an comin G's kno whass Poppin an how ta keep they Pimp Hands Way Strong

Someone That Is an Original Gangsta.
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being an all original gangsta.
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O.G., original gangster (pronounced "oh gee")

An O.G. is a senior gang member who has been in that gang since way back in the day and lived to tell the tale.

Unlike the more commonly used unabbreviated term "Original Gangster", this alternate definition refers to "Original Gypsy" meaning anyone that exhibits prowess in the ways of the gypsy (slight of hand, sticky fingers, trickery, cunning, charming, etc.)

adjective meaning "Over Gold"

Taken from the movie "I'm Gonna Git You Sucka" - a 1988 film spoof by (and starring) Keenen Ivory Wayans.

Jack Spade (Keenen) returns from the Army to his old neighborhood following the death of his brother, Junebug. The police determine Junebug's death to be the result of an "O.G.", or "Over Gold" — the victim has overdosed on gold chains.

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)