The upper-body equivalent of flatulence. A loud, smelly release of gas originating from the esophagus rather than the digestive tract. A burp with fart energy.
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.