During the winter, a man is likely to feel his dick getting cold. Having a boner while your cock is cold, is called a cocksickle (may be smaller than normal erections due to the low temperature.)
Gary: "Man, i was able to maintain a boner all through the winternight!"
Jerry: "So you had a Cocksickle?"
Gary: "I guess so."
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.