Definition of "OOC"

OOC

adjective
comparative more OOC, superlative most OOC
1. (roleplaying games, fandom slang) Initialism of out of character.
  Quotations
  Even then, some of the characters were pretty OOC (though I suppose that could be explained by the "magical effect" of the onions).
  2000 February 25, azirok [username], “Re: [Ranma][FanFic] Kuno Finds Out?”, in rec.arts.anime.fandom‎ (Usenet)
  It'd be OOC if Vejita[sic] weeped[sic] upon seeing Goku die at the hands of a big cricket thing. Because he saw it in the series and it didn't really bug him.
  2001 January 15, Talen [username], “Re: Funimation to aquire[sic] Yu Yu Hakusho....”, in alt.fan.dragonball‎ (Usenet)
  A lot of them seem to either almost completely remove Harry and co. from the fic and have the new characters doing all the wonderful things that Harry was supposed to do, or they have the characters acting completely OOC.
  2002 June 26, PriestesMiaka [username], “Re: Best Crossover fanfics?”, in alt.fan.harry-potter‎ (Usenet)
2. Initialism of out of contract.
3. Initialism of out of context.
adverb
not comparable
1. Initialism of out of curiosity.