foogoo fish Share definition Flag A poisonous fish, made up by the unicorns, friends of charlie the unicorn. While they were "sucba diving" unicorn 1- "oooh noo. here comes a school of poisonous foogoo fish"unicorn 2- "noooo!! foogoo!" foogoo fish by HeartKeeper<3 September 21, 2009 0 0 Get merch Get the foogoo fish mug. Buy Now — $32.95 See more merch