Corn horn Share definition Flag The appropriate sound to make after a particularly cheesy or corny statement to express your disapproval of such corniness. Man 1: "Did you hear what she just said... blow the corn horn" Man 2: "Cooooooooooooorny" Corn horn by Wagner01 September 24, 2010 0 0 Get merch Get the Corn horn mug. Buy Now — $32.95 See more merch