A redneck truck accessory hung under the back of the truck that looks
like a very large human scrotum. nutsack
Bigboys are hung to let
people know the truck and/or driver is masculine. It is all the
rage, and they can be seen on lorries and bigrigs, as well as tanks in Iraq. Mel Tilleson sports chromed bigboys on his CXT.
Bigboys are larger than bumper nuts and are seen in different colors and materials that are chosen for further meaning. See truck nuts.