ha ha! I get it... non-words, also know as nonce-words.
not to be confused with nun-words, or nonun-words.

tsuwm,

Question: private language is impossible, but what of words used once, are oncewords words if they had meaning, as these did, for just one other person? And then, are once words words at all, or were they words but once?

(There's a tiny word decapitation for you).