bubble gum machine 

A Highway Patrol Officer, derived from when the siren on a HP car was a single strobe and looked like a bubble gum machine.

Looks like the bubble gum machine done hit the jackpot (He pulled someone over).

bubble gum machine by Pork King April 30, 2003

Texas Bubble Gum Machine 

A state trooper's car, usually from the Lone Star State. The term became popularized in the film "Smokey and the Bandit."

We just passed a Texas Bubble Gum Machine at 100 Miles Per Hour.

Texas Bubble Gum Machine by T-Dog Jenkins February 24, 2005

bubblegum machine

A law enforcement vehicle, specifically a cruiser or highway patrol car. From the shape of the old-style revolving lights that resemble old gumball vending machines. CB jargon.

Got a bubblegum machine knockin' on your back door (there is a cop car on your tail)

bubblegum machine by Dr. Badwrench November 26, 2006