the old boy

Boy \Boy\, n. [Cf. D. boef, Fries. boi, boy; akin to G. bube,
   Icel. bofi rouge.]
   1. A male child, from birth to the age of puberty; a lad;
      hence, a son.
      [1913 Webster]

            My only boy fell by the side of great Dundee. --Sir
                                                  W. Scott.
      [1913 Webster]

   Note: Boy is often used as a term of comradeship, as in
         college, or in the army or navy. In the plural used
         colloquially of members of an associaton, fraternity,
         or party.
         [1913 Webster]

   2. In various countries, a male servant, laborer, or slave of
      a native or inferior race; also, any man of such a race;
      -- considered derogatory by those so called, and now
      seldom used. [derog.]

            He reverted again and again to the labor difficulty,
            and spoke of importing boys from Capetown. --Frances
                                                  Macnab.
      [Webster 1913 Suppl.]

   {Boy bishop}, a boy (usually a chorister) elected bishop, in
      old Christian sports, and invested with robes and other
      insignia. He practiced a kind of mimicry of the ceremonies
      in which the bishop usually officiated.

   {The Old Boy}, the Devil. [Slang]

   {Yellow boys}, guineas. [Slang, Eng.]

   {Boy's love}, a popular English name of Southernwood
      ({Artemisia abrotonum}); -- called also {lad's love}.

   {Boy's play}, childish amusements; anything trifling.
      [1913 Webster]