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.
"Those bigboys sure aint pingpong balls, that driver must be the real thing."
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