I found this on wikipedia. A left-handed individual may be known as a southpaw, particularly within sports in the United States. It is widely accepted that the term originates in baseball[12]. Ballparks are often designed so that the batter is facing east, in order that the afternoon or evening sun does not shine in his eyes. This means that left-handed pitchers are throwing from the south side. The first use of the term is credited to Finley Peter Dunne. However, the Oxford English Dictionary lists a non-baseball citation for "south paw", meaning a punch with the left hand, as early as 1848[13], just three years after the first organized baseball game. In boxing (not just in the United States) someone who boxes left-handed is usually referred to as southpaw. They are often considered trickier opponents than the more common right-hander. The term is also used to refer to a stance in which the boxer places his right foot in front of his left. (In the film Rocky, Rocky Balboa says the term came from a boxer named Paul, whose left arm always faced south to New Jersey.)