Deet Share definition Flag (n.) a person who looks ugly, is dumb, acts stupid, talks funny etc.Short term version of Deethadee Josh: “People from Phoenix are Phonecians.”Jim: “You’re such a deet Josh!” Deet by Bite My Ear November 23, 2017 0 0 Get merch Get the Deet mug. Buy Now — $32.95 See more merch