Which doesn't mean it's invalid or not a "real" word or whatever. But I'm a descriptivist and there doesn't seem to be much real use of this one to describe.
I have no idea where it came from and I think it's kind of fascinating. I've been seeing it for almost 20 years online, but it's almost like a few people just like it and want it to catch on.
I think at this point it's at the "stop trying to make sonder happen" stage.