The Jam Boy was first introduced as early as the 1800s when the British Empire occupied India. When the British gentry went to play golf, they would have two men, the caddy and a Jam Boy.
The Jam Boys sole purpose was to keep the mosquitoes away from the golfer. To do this, the Jam Boy would cover himself in Jam to attract the mosquitoes away from the players. When the game was over the Jam Boy got to keep the jam he was wearing to take home to his family.
Look at all the mosquitoes; I can hardly see the fairway, fetch the Jam Boys immediately!