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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.
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
Thanks,” she texted. “oc,” he responded.
oc by Calibeth June 17, 2018
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