Big Titty Bitch is just another word for a girl named Delyn, she’s a sweet hearted girl that is friends with everyone but yet has never had a boyfriend.
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.