Original Gangsta; the real-life definition of a street-level mentality; no remorse or concessions for a person's (or group's) behavior associated with violence, sex and crime. A way of life, of sorts, that doesn't provide explanations or apologies because this is the "reality" of aforementioned subjects. The rapper Ice-T coined this term globally with one of the defining albums of gangsta rap, O.G. Original Gangsta. O.G. can also apply to a first generation item or family name, i.e. George H.W. Bush = "O.G. Bush"
"Straight OG out of Compton with a loose cannon, smoke big green call it Bruce Banner"
by J_Nasty April 16, 2009

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Original Gamer - someone who's been in the gaming industry ever since the dawn of Atari and Nintendo.

anyone who owns an old school game system, such as a Sega Genisis or an NES.
dude, Bob is such an O.G. He has Turbo Graffix games, Magnavox Odyssey, and a Super Famicom imported from Japan!
by El Juegon66 August 06, 2007

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Abbreviation of Old Greg, taken from the TV show "The Mighty Boosh", an OG is someone who drains the living life out of people. He wants to be loved by all, however his insistance to be friends with everyone is what eventually drives all away.
John: "Dude, did you hear Steve Baldwin is hosting the Oscars?"
Michael: "That's weird, he's a real OG."
by OXHC June 02, 2011

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Original Greg (Nance). It used to mean Original Gangsta, but that meaning is slowly being phased out.
That greg nance is OG.
by truthspeaker505905 April 28, 2011

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Original Guido (Jersey Shore)
Damn that guy fist pumps like an OG
by Baamzz January 17, 2011

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Stands for "Original Gangster".

Someone who is awesome, legit, amazing, etc.

Someone who has an awesome personality and it considered "cool".
That girl Casey is a total "OG"!
by C-swizzle fo shizzle November 06, 2010

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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.
by tirdbergler July 20, 2008

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