Driver's One-Eighty is a term used to describe a U-turn, or a 180 degree turn. It is commonly used by drivers when they need to turn around and go in the opposite direction. The acronym UEY stands for 'U-turn Executed Yield, ' which is a driving maneuver that requires the driver to yield to oncoming traffic before making the U-turn. This term is often used in driving tests and is a necessary skill for any driver.