og 

on god. use it when youre being serious and want someone to believe it.

Paul: og i didn't eat your last slice of pizza
John: okay man I believe you

og by fundamentalist101 January 16, 2017

OG 

A word used to describe the first release of a numbered Jordan (1-23).

Kid: Those Air Jordan 1's are sick!
Other Kid: Yeah, they're OG's from 1985!

OG by Shawayne21 February 15, 2009

OG 

Slang for the Olive Garden.

Hey guys who wants to have bottomless soup at the OG?

OG by Luke Prtz January 17, 2008

OG 

Original Gangster Or Oriental Gangster.

Wow, that guy is OG!

OG by KyleTEG June 29, 2015

OG 

Original Greg (Nance). It used to mean Original Gangsta, but that meaning is slowly being phased out.

That greg nance is OG.

OG by truthspeaker505905 May 21, 2011

OG 

Original Gansta
Or
Ol' Girl
Which means your mom.

Ice T is an OG

Ma OG keep calling me, damn, I think she found out I got an F on my exam.

OG by DamnIt69 May 11, 2010

OG 

Organically Grown.

Food grown and processed using no synthetic fertilizers or pesticides.

"Organic Dark Chocolate (OG cacao beans)"

OG by Freak Nasty B September 22, 2008