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Stands for

O-Official
C-Card
G-Grammar

This refers to specific phrases and terminology that should be used when creating a card for a certain trading card game.
Namely Yugioh.
Bad OCG - lose 500 lifepoints, then summon a card with less than or equal to 1500 attack points from your deck or grave to your side of the field. When your turn is done, remove the summoned monster from the game entirely.

Correct OCG - Pay 500 Life Points. Special Summon 1 monster with an ATK of 1500 or less from your Deck or Graveyard. At the End Phase, remove from play the monster that was Special Summoned by this effect.
by Shaco February 09, 2008
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OCG, or Original Crip Gang, or Original Cambodian Gang. Originated in Stockton, CA in the 1980's with members being primarily of Cambodian Descent. They claim Royal Blue, and are one of the most feared Asian Gangs today.
gangstercripOGCambodianOCG
by OG C Loc August 24, 2009
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buy the domain for your travel vlog
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Obessive Compulsive Googler. Someone who is constantly looking things up on Google.
Hailey : "Hey Jen, what does creme brulee taste like?"

Jennifer : "I dunno..WAIT! Let me google it!!"

*runs to computer*

Samantha : " Wow...I think Jen has OCG. That's the third time she's googled something today!'
by google_lover August 17, 2010
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Old Cool Gangsta. Can be used as a greeting or as a title. Meaning to be a bad dude in a foul mood. Perhaps this ocg is a playa, or is putting a hate on someone. None the less, he is steet salted with experiences under his belt, stays calm and cool in all situations and has the ability to take care of business if needed.
by da godfatha October 17, 2005
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short for "one cool guy" a great ska group, i think some of the members went into streetlight manifesto
by poop March 30, 2004
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abbreviation for "Obsessive Compulsive Googling".

When every time you mention a topic or question in conversation, the listener impulsively Googles it.
Jim: "I wonder what the capital of Costa Rica is."
Bob: starts typing "What?"
Jim: "I said, I wonder what the capi-"
Bob: "San Jose."
Jim: "Bob, you got OCG. Y'know what that is?"
Bob: begins typing "OCG"
by RumpoleIsDead February 17, 2010
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