Is a current bastardization of a very old American word, Yankee. Which is a bastardization of the first, John Cheese. The first American settlers were dutch, and the first person who bought Manhattan, was Anneke Jans. So when the British settlers came over and were trying to diss the Dutch, they called them Yawn Kees, or John Cheese. So Janky is a mispronunciation of jankees, which is how you spell it. Trip out. Now you know.
That shit don't work, its janky.