Golfer is a character Kevin created in his Tiger Woods PGA Tour Let's Play.
His name is one of the many ones the player can chose to name an original character. Chosing such a convenient name is something obvious, because funny as feck, for Kevin. Indeed, he imagined Golfer's parents were really into getting their son in a golfing career.
As an absolute unit, Golfer weighs the heaviest weigh possible in the game: 145kg. He's also very tall, and as Kevin states, his clubs must be very expensive because of that.