When YOU do it, it's an illegal U-turn. When a police officer does it, it's a Donut Maneuver for obvious reasons.
That police officer just made an illegal U-turn! What the hell?

Just let it go man, police officers perform Donut Maneuvers like that all the time.
by RoboCop 3000 April 12, 2011
Get the Donut Maneuver mug.