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.
Wiktionary lists both “laughing out loud” and “lots of laughs”. Nowadays though it’s neither; on a pragmatic level it doesn’t convey “I’m laughing” / “I laughed”, it conveys amusement and/or lack of seriousness, depending on the context.