I’ve seen it many times, but this is the first time I asked. So in answer to your question, yes, I’ve been here since ‘98 and didn’t know what it means.
It took me a while to figure out what "LOL" means. It's sickeningly overused, unless people are literally laughing out loud every time they use it.
Then we get "roflol", rolling on the floor laughing out loud. If people are literally doing that, they need to be put in the nut house.
There are many others used on here and I don't know what they mean and don't really care to learn to speak in abbreviations.
Use them on my friend and fellow member "DaleReed", and see what he tells you.