Mine is OOO for Out Of Office. I always misread it in my head like a ghost and it takes me a few seconds to process. It also doesn’t translate to speech—you have to say the whole thing.
Interested to see if others have similar acronyms they beef with.
If someone is doing that to you it means they don’t like you or are otherwise done with your shit. It’s also a way of saying “I really shouldn’t be saying this” as kind of a way of addressing what you’re said before is fucked up but insisting the need to communicate it regardless.