Can mean "original poster," "opposition," "overpowered"

"I heard them making fun of me behind my back and that's when I realized they're not my friends. They're an op."
History and usage

Initially, "op" emerged in African American Vernacular English (AAVE) as a shortened form of "opposition" or "opponent," commonly used in street and gang culture to refer to rivals or enemies. In this context, "op" denoted individuals or groups perceived as adversaries, often used in rap lyrics, street slang, and urban communities to signify opposition or conflict. However, its meaning gradually expanded beyond its roots in street culture to encompass a broader range of contexts.

In contemporary usage, "op" has become a versatile term employed in various social media platforms, particularly within online gaming communities and internet culture. In this context, "op" is often used to refer to overpowered or overperforming elements within a game, such as characters, weapons, or strategies that are deemed excessively strong or imbalanced.

Additionally, "op" is frequently used as an abbreviation for "original poster" in online forums and discussion threads, indicating the individual who initiated the conversation or shared the original content. "OP" has become ingrained in modern language, seamlessly integrating into everyday conversations, social media discourse, and online interactions. Its multifaceted usage reflects the dynamic nature of slang and its ability to adapt and evolve within different cultural contexts.