Fecoo Share definition Flag A wild bird that flips people off and makes a noise that sounds like "Fe-kooo." Watch. Out. For. The. WILD FECOO!!!! The wild fecoo flipped off my sister. Fecoo by Isaac Newton IV May 22, 2011 0 0 Get merch Get the Fecoo mug. Buy Now — $32.95 See more merch