資料來源 : Webster's Revised Unabridged Dictionary (1913)

Boy scout \Boy scout\
   Orig., a member of the ``Boy Scouts,'' an organization of
   boys founded in 1908, by Sir R. S. S. Baden-Powell, to
   promote good citizenship by creating in them a spirit of
   civic duty and of usefulness to others, by stimulating their
   interest in wholesome mental, moral, industrial, and physical
   activities, etc. Hence, a member of any of the other similar
   organizations, which are now worldwide. In ``The Boy Scouts
   of America'' the local councils are generally under a scout
   commissioner, under whose supervision are scout masters, each
   in charge of a troop of two or more patrols of eight scouts
   each, who are of three classes, {tenderfoot}, {second-class
   scout}, and {first-class scout}.

資料來源 : WordNet®

boy scout
     n 1: a boy who is a member of the Boy Scouts
     2: a man who is considered naive