Issy Bird Share definition Flag Issy Bird is a vagina. A silly word used by teenagers. Liz: Omg did you see Dezarys issy bird hanging out of her skirt today. Marlee: Eww yes. Issy Bird by Ballball3131 September 30, 2015 0 0 Get merch Get the Issy Bird mug. Buy Now — $32.95 See more merch