O.C.C. One Character Comeback
Stands for "one character comeback." Mainly used in fighting games such as Marvel vs. Capcom 2 or Capcom vs. SNK 2. It is where you beat your opponent (more than 60% of his life) with just your last character. Definition was originally created by Megaman DS.
Justin Wong OCCd Desmond by killing off all 3 of his characters with just 1% life left only on his Cable.