Jay-Z's imaginary friend.
Catch me at the X with OG at a Yankee game.
by Tikibarberfan March 06, 2010
Original Giani
OHHH SHIEET LOOK AT THAT OG'S PUGH!!
by ORIGINAL GIANI August 16, 2011
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
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.
by DamnIt69 May 11, 2010
Mike Ogulnick, the man with the bushiest eyebrows in all of Chicago radio, now the radio host for the Texas Rangers. The mackest of the mack daddies.
OG is the very definition of a smarmy douchebag.

Most annoying of all, though, is the inexplicable narcissism that defines OG's broadcasts.

MJH were ripping OG because Jurko laid out $200 to buy breakfast for the ESPN staff and OG, upon spying the sumptuous spread, whined that "there's no butter for my bagels".
by Anusface aka Penisbreath November 12, 2009
any original gangster from any original street gang.
my tio is an o.g. from the west side longos.
by sisters of the o.g. November 23, 2005
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
To be used in place of the word "hello".
Can also be used in place of Hi, but never Hey.
Person 1: Og
Person 2: Og, how are you?
by I have 3 first names June 01, 2011

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