its often used in circles relating to japan for awhile, mainly anime as shows like Welcome to the NHK(2006) cover it. still technically speaking, not a new term, and i wpuldnt be suprised if /A/ on 4chan used it for more than a decade now. definitely not recent.
Well I’m sure it’s been in use for a while, but not in mainstream internet lingo is my point.
Speaking for myself, I only learned about this term a year or so ago, because I remember looking it up, and I remember thinking: huh, so there’s a word for that now. Since then, I’ve seen it come up several times, almost always in greentext posts like this one.