jibber head Share definition Flag A word that describes a person that is without knowledge of a given subject. Derived from the fattest boy alive, Cody Rogers. "You call me that again I'll pee on you, jibber head" jibber head by Sonny Campbell April 15, 2005 0 0 Get merch Get the jibber head mug. Buy Now — $32.95 See more merch