Jingo

1

“By jingo!” is an archaic, jocular oath, of obscure origin, used in Britain in the 18th and 19th centuries. The word — with derived forms such as ‘jingoism’ and ‘jingoistic’ — became associated with aggressive, militaristic nationalism as a result of a popular song dating from the Turko-Russian war of 1877-78, which began:

Interestingly (in the light of the circumstances of this particular war), it is also the name of a warlike Japanese empress of the 2nd/3rd centuries, credited by legend with the power of controlling the tides.