The Collaborative International Dictionary of English v.0.48:

Caddie \Cad"die\, n. [Written also caddy, cadie, cady, and
   cawdy.] [See Cadet.]
   1. A cadet. [Obs. Scot.]
      [Webster 1913 Suppl.]

   2. A lad; young fellow. [Scot.] --Burns.
      [Webster 1913 Suppl.]

   3. One who does errands or other odd jobs. [Scot.]
      [Webster 1913 Suppl.]

   4. An attendant who carries a golf player's clubs, tees his
      ball, etc.
      [Webster 1913 Suppl.]