Webster's Revised Unabridged Dictionary · 1913

Jingo

Jingo , noun

[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; a bellicose superpatriot or chauvinist. [Cant, English]
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.