bonkhead Share definition Flag • a total idiot • a stupid person • a penis-head person 1: hey, whats 3 x 7? person 2: uh idk 37?? person 1: no! you bonkhead!! bonkhead by Gyugarnagle June 30, 2022 0 0 Get merch Get the bonkhead mug. Buy Now — $32.95 See more merch