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.
A cool turn on that one is by the Arch Linux Wiki, which calls it Read The FINE Manual. Owning to the fact that this particular wiki is quite excellent. I use Arch BTW.