When a vehicle lacks a muffler, or is otherwise intrinsically
obnoxious or
obnoxious by virtue of its owner, and vigilantes or
society at large decide to tie the carcass of a dead opossum to the vehicle to display distaste for the vehicle or its driver.
"F--- that
guy, if he declines his engine in front of the house again, he's getting an (o)
possum muffler."
"We gave the
Purple Avenger a 'Possum Muffler."