Fucktastic Share definition Flag A word used in place of saying "fucking fantastic." Usually used in a sarcastic manner. The chemistry test is today?? Fucktastic."Dude, there's a cop chasing us!" "Fucktastic." Fucktastic by May1099 November 15, 2013 0 0 Get merch Get the Fucktastic mug. Buy Now — $32.95 See more merch