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.
This is why I don’t think we should be bothering with the distinction between initialism and acronym in casual conversation. Everyone has their own way of using words and phrases that can be radically different, and there seems to be no disctinctive rules on when you can and can’t pronounce them.