some will tell you that it means People for the Ethical Treatment of Animals these people are generally unhappy because they do not eat enough meat and would be in a better mood if they frieking ate a cheeseburger (vegetarians)
Farmer Joe is a member of P.E.T.A. he hunts deer and eats them when he catches them cause they taste really good
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.