You are right in principle. New words can pop up. Them being accepted however is not just a matter of a few people using them and saying that it is so.
It’s about usage and being accepted in larger groups or areas. Language is defined by what’s surviving a generation or two. Everything else is slang.
Dreh die Antenne nach links, ich krieg nur rauschen hier unten.
It would be white noise, “weißes rauschen”, but nobody ever said the “white” part.