Automotive accessory installed by very stupid, anti-social, greasy-haired Pachuco boys in their cars. They do this for two reasons. First, it annoys decent people. Second, it will make them deaf as a post, and liberal politicians can offer Pachukes yet another entitlement, free hearing aids paid for by YOU and YOUR taxes.
The greasy-haired Pachuco cruised through the neighborhood with his whompers blasting.