plain wrapper
'70s CB slang for an unmarked police car, usually used with the color of the car between "plain" and "wrapper."
There's a plain wrapper, blue, up at mile marker 128.
plain wrapper
the po po, 5-0, the police, smokie or cops.
That plain wrapper just pulled someone over.
plain white wrapper
An unmarked police car with a radar gun. Also known as a Hemorrhoid with a Polaroid, or Kojack with a Kodak.
"Careful on your way in to town, there is a plain white wrapper sitting beside the road checking speeds"