Good to see that the name of The Argotist Online ("argotist") has now become part of the lexicon. It is a portmanteau word, created by the editor of the The Argotist Magazine, Nick Watson, in 1996. He said he had combined the word "argot" with the "ist" from the title of the 1914-1919 literary magazine The Egoist, which Ezra Pound was involved with. I don't recall it as a word existing before then.