Gum Shank Share definition Flag When someone asks you for a piece of gum, and you hit them in the face with it. Then and only then, can they consume said piece of gum. Someone: "Hey can I have a piece of gum?" You: (Throw Gum) "GUM SHANK!!!!!!" Gum Shank by Gum shanker April 24, 2009 0 0 Get merch Get the Gum Shank mug. Buy Now — $32.95 See more merch