To drive a vehicle in reverse and throw it into a tight spiral, where at least two wheels are sliding rather than rolling.
Compare doing doughnuts, which is to throw a vehicle into a similar tight spiral, but starting in a forward gear.
To do so strictly for the hell of it is not required, but generally implied.
Usually performed in an empty parking lot, blacktop area of a junior high school playground, etc., after a freezing rain or a large enough snowstorm to render the surface very slippery.
Brian and I took his old Chevy Nova out to the mall after the big snowstorm to do a doughnut and whip a shitty.
A sunburn or suntan focused on the left arm. It is caused by the left side of the body being the only half that gets exposed to sunlight while driving. Presumably, it would be located on the right side of the body in countries where they drive on the left side of the road.