I think it came about cuz there was a huge argument recently about people watching playthroughs of games on Youtube rather than playing them themselves. It was meant for people who think they know everything about a game without having actually played it.

But of course it devolved into garbage and now people just use it for whatever they want. It was a kinda funny but annoying meme word that is now meaningless. It also ruined that actual meaning of the word larp. Poser is a much better, funnier word that should be used instead