To inform authority of an action, usually the violation of a rule, that could lead to the person who performed the action getting in trouble. Can also be used to describe a person who is prone to such behavior.
Jeremy is such an op. I tried to cheat on my test, but he opped on me.

Please don’t op, bro. Don’t be a dick.
by FratHouseOnFranklin October 15, 2019
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Op is short for the word opposition
" If you're not down for the squad you're an Op"
by Yungboy Yogi July 6, 2017
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Over-Poweredness
The OPness of that character is extreme.
by FP350z April 29, 2009
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Short for Original Poster. Used on online message boards and forums.
The the message the op posted is idiotic.
by Joe December 31, 2004
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1: A reaction for something small but silly happening.

2: Said after a witty remark.
Ex.1: General. OPE!

Ex.2:

P1: Fatty says what?
P2: What?
P1: OPE.
by Niko Jims January 9, 2010
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Ops are members of an opposite gang or a snitch
Yo send two hitters to clap those ops
by 905 shooter January 14, 2018
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(pronounced 'no op', from NOP the computer assembly language instruction that tells the computer to do nothing)

Loser; a stupid or lazy person.
He's a complete no-op. Ignore him.
by node-edon April 3, 2006
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