any original gangster from any original street gang.
my tio is an o.g. from the west side longos.
#old timer #godfather #s.a. #cholo #low rider
by sisters of the o.g. November 23, 2005
Overly Gay

Someone that Over usess OG and names them self an OG.
OG can only be given to someone by a group of people that are thier peers.
That gamer can't be an OG he named him self an og and he is less then 30 years old maybe he is an OG - Overly Gay
#og #overly gay #original gangster #name #gamer tag
by HotShotKev February 17, 2014
Original Giani
OHHH SHIEET LOOK AT THAT OG'S PUGH!!
#original #giani #og #o #g #gangster
by ORIGINAL GIANI August 16, 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?
#og #ogg #oog #hello #hey #hi #tiarnie #and #lachlan #are #awesome
by I have 3 first names June 01, 2011
Older Girl. Similar to LG: little girl. but if you are a little boy and you are going out with and older girl
Dude, are you going out with an OG? niceeeee!
#lg #lb #cougar #vagina #poop #sex
by poopismylife May 17, 2011
Olive Garden - an American Institution
Let's go to the o g.
#og #o.g. #olive garden #oh gee #oli garden
by girly girl 123 November 11, 2010
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.
#mom #mother #ganster #gansta #original #ice t #snoop dogg #your mom
by DamnIt69 May 11, 2010
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