WordReference Random House Unabridged Dictionary of American English © 2015
old boy  (ōld boi for 1, 2; ōld boi′ for 3;
ōld′ boi for 4),
  • Informal Terms[Informal](sometimes disparaging). an adult male, esp. a Southerner. Cf.good old boy. 
  • a lively elderly man.
  • British Terms[Chiefly Brit.]an alumnus, esp. of a boys' preparatory or public school.
  • British Terms[Chiefly Brit.]See old chap. 
  • Etymology:1595–1605

    Collins Concise English Dictionary © HarperCollins Publishers::

    old boy n
    1. (sometimes capitals) Brit a male ex-pupil of a school
    2. informal chiefly Brit a familiar name used to refer to a man
    3. an old man

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