O

OBV / OBVI

Obviously

OFC

Of course

Ohio

Slang used to mock a place (often generically) as bizarre or chaotic, based on a running meme about the state

OK Boomer

Dismissive retort used by younger generations toward out-of-touch older opinions

Old Money

Aesthetic evoking inherited wealth through understated, classic tailoring rather than flashy branding

One Does Not Simply

Screenshot of Sean Bean as Boromir in Lord of the Rings, captioned "One does not simply [walk into Mordor]"

ONG

On God; emphatic affirmation, similar to "I swear"

Oof

Expression of sympathy or discomfort at someone's misfortune

OOTD

Outfit of the day

OP

Original poster (forums) or "overpowered" (gaming)

OP (Overpowered)

Describes a character, weapon, or strategy considered unfairly strong

Opp

A rival or enemy

Orbiting

Continuing to like or view someone's social media posts after ending communication, keeping a presence without engaging directly

Outfit Check

Short video format showing off a person's outfit, often with a spin or pose

Overly Attached Girlfriend

Screenshot of YouTuber Laina Morris with an intense stare, representing clingy relationship behavior