ISNUSB Share definition Flag "I smile and you smile back". Used as a Facebook comment closing message to send positive thoughts and well wishes. Originated at Mitchy's Luv Shack in SE Oklahoma. Spread that LOVE and keep smiling on....ISNUSB!!! ISNUSB by PDX DMM November 1, 2012 0 0 Get merch Get the ISNUSB mug. Buy Now — $32.95 See more merch
