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Phrase used to describe an "obsessive compulsive" trait. If the person seems to have an repetitive desire, or somewhat recurring and absurd need, then he/she will be regarded as "OC"
"I need to type up all of my history notes from today." -"Dude, you're so OC"

"Black pens are all I write with; color disturbs me"
"Dawg, you're OC"

OC by KBGM February 8, 2008
Meaning "Own Character" an OC is a character made up by a person, to be used literally as thier "own character" for fanfictions,(with or without a character from an anime series) picture ideas, ect. An OC is often a non-human, (i.e. Vampire, Werewolf, ect.) or sometimes an anthro character. It is also often for OC to be in anime-style when drawn.

On occasion, groups of friends will act and speak like thier OCs would, for fun. They often "switch" between each OC and thier own personalites.
Amy: Omg i just wrote a really random fanfic about my OC, Kitty and Nicole's OC, Ben.
Jane: Haha, cool. I just finished Drawing a pic of my OC, Danny!

Amy: (Talking as her OC) Yeah, Amy wrote the craziest story, even I don't get it! and I'm 1126 years old!
Jane: (also as OC) Ha, well Jane-chan drew an AWESOME picture of me!
OC by DarkPeaceLove May 14, 2009
1. (adj.) Relating to or characterized by a tendency to dwell on unwanted thoughts or ideas or perform certain repetitious rituals, especially as a defense against anxiety from unconscious conflicts: obsessive-compulsive behavior.

2. (n.) An obsessive-compulsive person.
OC by Bruce January 10, 2005
overclock its something you do when you gives your pc more power.
oc by hyper-h December 30, 2010
This acronym means “of course
Thanks,” she texted. “oc,” he responded.
oc by Calibeth June 17, 2018
THE GREATEST PLACE IN THE WORLD, Short for OCEAN CITY, MD.
I am going to OC for a week on Saturday, July 24, 2003. It's gonna e great!!
oc by Jeff Harris July 24, 2003