Metal or coloured moulded testicles attached to the back of your truck, possibly present to demonstrate to the world the size of your actual testicles, or to compensate for a certain lack in that department...
"dude check out the trucksticles on that rednecks pickup, he must be making up fo something..."
the ballsackes you can put on truckes that come in vayrous sizes and colores.
guy1:look at that truck.
guy2:ya it has trucksticles