Gyyy Share definition Flag Pronounced like "Guy". The stretchy skin on your elbow. The medical term for it is Wenis. First used in the early 2000's. "Dude, stop pinching my Gyyy", "I have this big gash. on my Gyyy" Gyyy by Moser April 28, 2006 0 0 Get merch Get the Gyyy mug. Buy Now — $32.95 See more merch