Yildy Share definition Flag Scottish slang for 'great', 'fantastic' or simply something which is positive. Most commonly heard in Glasgow and usually spoken after the word 'fucking'. Oh, I got a text, fuckin' yildy! Yildy by Pyrit January 20, 2009 0 0 Get merch Get the Yildy mug. Buy Now — $32.95 See more merch