Your Sister is a Mister Share definition Flag The ultimate comeback that were Steven Hawking’s final blessings to us before his passing. Steven: Your sister is a mister... *final breath*Man: What an OG that man was Your Sister is a Mister by The Kluxinator March 15, 2018 0 0 Get merch Get the Your Sister is a Mister mug. Buy Now — $32.95 See more merch