\Jin"go\, n.; pl. {Jingoes}. [Said to be a corruption of
St. Gingoulph.]
1. A word used as a jocular oath. ``By the living jingo.''
   --Goldsmith.

2. A statesman who pursues, or who favors, aggressive,
   domineering policy in foreign affairs. [Cant, Eng.]

Note: This sense arose from a doggerel song which was popular
      during the Turco-Russian war of 1877 and 1878. The
      first two lines were as follows:

            We don't want to fight, but by Jingo if we do, We
            've got the ships, we 've got the men, we 've got
            the money too.