Originally Posted by St Fan
TV Tropes never pretended to be inventing anything, only repertorying already-existing tropes. Including for tropes name; if there's a widely-known term used, it will get preference. "Jumping the Shark", "Hanging a Lampshade", "Breaking the Fourth Wall"... all those are descriptive terms used in fiction for a while already.
On the other hand, terms like "Narm", "Flanderization", and "Xanatos Gambit" most likely weren't. I believe there's a substantial faction on TVtropes that wants every trope name to be some obscure term they coined, in the hopes that the meme takes off (which, of course, it rarely does).