ball nafer

Someone who attempts to eat/bite off their own testicles / nuts. (Not the penis)

Jimmy: "My cousin is a ball nafer!"
Glen: "Are you for real?
Jimmy: "Yeah, no joke.. saw it with my own eyes"
Glen: "He must have been very horny to try something like that"
Jimmy: "He wasn't horny, he was really mad..."
Glen: "........"
Jimmy: "......."
Glen: "What the fuck?"