OG 

It is the abbreviation of original gangster

"Please I'm the real OG, son!"

OG by Lil angel July 2, 2015

OG 

Original Geek. A hardcore geek.

Did ya hear what happened to Irwin's website? It took a slashdotting and it's still up. Man, he's OG.

OG by Randy McNally June 12, 2004

OG 

good kush

Stoner 1: Yo my homie is on D with some OG right now

Stoner 2: Fasho! Hit him up!

OG by Ferris A. April 20, 2009

OG 

Old Gangsta or Original Gangsta

DJ: hey who this
Kasi: its kasi
DJ: ohh hey wat up OG

OG by heatressxpimp May 2, 2005

OG 

Old Grandma or Grandpa.

Slap dat OG fo pissin on hiself and put his old ayass into a home cuz.

OG by OG-Z January 25, 2008

OG 

Original German. Refers to products originally manufactured in Germany, often when referring to parts used on vintage Volkswagen automobiles. In a similar context, it may also refer to original.

I just installed an OG front seat in my 1954 Barndoor Kombi.

OG by Everett Barnes August 6, 2004

OG 

A type of kush that leaves a sizzling taste in your throat and gets you high instantly. But they must only be smoked by Asians or Niggers. White people who attempt to smoke this kush risk that chance of not remember what just happened to them.

Yo nigga pass me some of that OG!" *Passes joint to the Asian* "Thanks Bro

OG by Fedor Visentin December 25, 2010