Also referred to as a bird dog; Someone who will flush the cops out of the brush
A car passes you on the highway, doing 10-15mph better than your speed.
Passenger: Hey, why are you speeding up? you trying to catch him?
Driver: Nope, found a cop cleaner (bird dog) to flush out the speed traps!
September 19, 2005 Urban Word of the Day
A car that passes you on the freeway driving much faster than you (and the speed limit). By pacing this car at a distance, speed traps along your route will catch the other driver instead of you.
"Dude, I picked up a cop cleaner on my way over and got here fast!"