Truck nuts, also known as truck balls, are accessories for pickup trucks an other vehicles. Capitalizing upon the association of trucks with machismo, truck balls resemble oversized human testicles inside scrota of various colors. This trend began in the United States in 1998 and first sold on the internet in 1999. Truck nuts are used as a statement by the car, truck, ATV, and/or motorcycle owner to boast/amuse/shock him/her self and others.