Efffftttt Share definition Flag A word used to describe your reaction to something funny or something frustrating. Efffftttt - that's hysterical. Efffftttt - that's disgusting. Efffftttt - I don't believe it! Efffftttt by beentheredonethat December 19, 2004 0 0 Get merch Get the Efffftttt mug. Buy Now — $32.95 See more merch