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.]
⇒ 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.
© Webster 1913.