noun: (Internet) An operator on IRC, who can moderate the chat channel, ban users, etc.
verb: (transitive, Internet) To promote (an IRC user) to an operator.
verb: (Australia, informal, transitive) To buy (something) from an op shop.
verb: (Australia, informal, intransitive) To shop at op shops.
noun: (informal) Clipping of operation. [The method by which a device performs its function.]
noun: (Internet slang, chiefly in the plural) Clipping of opinion. [A belief, judgment or perspective that a person has formed, either through objective or subjective reasoning, about a topic, issue, person or thing.]
noun: (chiefly attributive) Ellipsis of op art. [(art) A genre of abstract art that uses geometric shapes and vivid colours to create optical illusions, such as an illusion of movement.]
noun: (Internet slang) Alternative letter-case form of OP (“original post, original poster”).
noun: (slang, among criminal gangs) Alternative form of opp (“opponent; opposition”). [(slang, among criminal gangs) An opponent; an enemy; the opposition]
noun: Initialism of Overall Position.
noun: (theater) Initialism of opposite prompt; stage right.
noun: (Internet) Initialism of original poster; the person who started a thread.
noun: (Internet) Initialism of original post.
noun: (military, law enforcement) Initialism of observation post. [a lookout or vantage point]
noun: (organic chemistry) Abbreviation of organophosphate. [(chemistry) Any ester of phosphoric acid or its derivatives, especially one used as an insecticide or herbicide.]
noun: (slang) Initialism of other person's; a cigarette cadged from someone.
adjective: (publishing) Abbreviation of out of print.
adjective: Abbreviation of overproof. [Possessing a higher proportion of alcohol than proof spirit.]
adjective: (video games) Abbreviation of overpowered. [Overly powerful.]
adjective: (Internet, music) Initialism of overplayed. [Played too frequently.]
noun: (religious) Initialism of Ordo Praedicatorum (Order of Preachers, the Dominicans, a religious order).
noun: Initialism of opening credits. [The credits shown at the beginning of a film, TV program, etc.]