A hooker or a hook-up girl that was used the night before. She is usually seen looking for a ride. Could be partially dressed or a little messy with the personal hygene. Lipstick is smeared, wearing a mans shirt, stinky..
The pump & dump was seen hitch hiking trying to get a ride back to town.
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.