Jingoism is one of the few political ideologies named after a pop song — a music-hall tune from 1878 that turned an old conjurer's exclamation into a label for warmongering patriotism.
Extreme patriotism, especially in the form of aggressive or belligerent foreign policy; chauvinistic nationalism.
From jingo, originally a mild oath (by jingo!) of uncertain origin, possibly a euphemism for Jesus. The political sense arose from a popular music-hall song of 1878 during the Russo-Turkish War crisis: "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." Key roots: jingo (English: "exclamatory oath, possibly euphemism for Jesus").