Op

Op is a contemporary slang term that originates from the abbreviation of "opponent" or "opposite." It is commonly used to refer to someone who is seen as an adversary or a person on the opposing side, rather than an ally. This term is often used employed on social media, and everyday conversation to describe individuals or groups that are in opposition to one's goals, views, or interests.

Federico: "I heard from Kayla there's a new dealer on the next block."
Jay: "Oh, that guys an op for sure. We need to smoke that fucker."

aleczen_98: "I posted my opinion, and now all these ops are in my DMs arguing with me."
dawidajugoslavija: "The ops will always show up. They can't handle a civil discussion"