The term 'road reversal, in slang' can be summarized as a U-turn or a 180-degree turn. This is a common phrase used to describe a situation where a driver turns around and goes back the way they came. UIE and UEY are two slang terms for this maneuver, with UIE standing for 'U-turn in the opposite direction' and UEY meaning 'U-ey in the opposite direction'. Both terms are used to describe the same action, which is to turn around and go back the way you came.