Tongue bifurcation, splitting or forking, is a type of body modification in which the tongue is cut centrally from its tip to as far back as the underside base, forking the end. Bifid tongue in humans may also be an unintended complication of tongue piercings or a rare congenital malformation associated with maternal diabetes, orofaciodigital syndrome 1, Ellis–Van Creveld syndrome, Goldenhar syndrome, and Klippel–Feil syndrome.