one-eyed unicorn Share definition Flag (n.) The rear-view of a cat's butt with it's tail up. Every morning when I wake up, my cat jumps on my chest, turns around and shows me her one-eyed unicorn. one-eyed unicorn by lepetithibou October 4, 2010 0 0 Get merch Get the one-eyed unicorn mug. Buy Now — $32.95 See more merch