Truck nuts

Truck nuts, also known as Truck nutz, truck balls, BumperNuts, BumperBalls, CargoNads, Drive-thru Danglers, Trucksticles, HitchNuggets, Highway Hangers, Balls-on-a-truck, or, as they are known in the United Kingdom, Bumper Bollocks, are plastic or metal accessories for pickup trucks and other vehicles which resemble a pair of dangling testicles. Truck nuts are usually hung for humour or amusement. They are attached under the rear bumper of the vehicle so they are visible from behind.