Radar Detector 

When a car is driving ahead of you and just a little faster than you.

See that red car up there? He's my radar detector.

That Toyota just got pulled over, I had better slow down until I find myself another radar detector.

Radar Detector by Harmony08 October 4, 2010

radar detector 

A device that can be installed into your car. Use it to easily spot cops within a few miles depending on the quality of your radar. Highly illegal in most states.

With out my radar detector, I would have had my license suspended by now.

radar detector by ic3 man May 15, 2006

Ukrainian Radar Detector

Ukrainian Radar Detector (noun): A speeding vehicle which when followed, acts as a radar detector for the vehicle behind it, by being detected at radar traps and pulled over, thus allowing the following vehicle to pass the radar trap.

Etymology:

-The premodifier "Ukrainian" is in place to denote the low-budget, hack-job, ghettoness of using a "Ukrainian radar detector"

-The head of the noun, "radar detector" is used ironically in that the vehicle does not actually detect radar waves, but simply distracts the police for the vehicle behind it.

Driver: "There's a speed trap ahead, we'd better follow another speeder so he can be our Ukrainian radar detector."
Ukrainian: "Yes! Ukrainian radar detector is best radar detector!"

Ukrainian Radar Detector by Viktor Yanukovych January 25, 2014