jingo

n.; pl. Jingoes [ Said to be a corruption of St. Gingoulph. ] [ 1913 Webster ]

1. A word used as a jocular oath. “By the living jingo.” Goldsmith. [ 1913 Webster ]

2. A statesman who pursues, or who favors, aggressive, domineering policy in foreign affairs; a bellicose superpatriot or chavinist. [ Cant, Eng. ] [ 1913 Webster +PJC ]

☞ 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: -- [ 1913 Webster ] 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. [ 1913 Webster ]