First off, ALL words are ‘made up’.
Second, just because you don’t know a word doesn’t mean that others don’t know it and use it.
Maybe you meant to say that you think the word ‘hinky’ is slang or argot, cant, dialect, jargon, jive, language, lingo, patois, patter, shop, or shoptalk.
Actually, what I MEANT was to make a funny reference to a movie line but no one here seems to be following along. No worries. I don’t give a crap how people talk. To a lesser observer, the use of “words” like ain’t, cred, and hinky may seem like hip speak or dialed in rhetoric. But, as has been said by Kings and Queens, I am not a lesser observer.