jingo
Concise Oxford English Dictionary © 2008 Oxford University Press:
jingo /ˈdʒɪŋgəʊ/
▶noun (pl. jingoes) dated, chiefly derogatory a vociferous supporter of a patriotic war policy.
– phrases
by jingo! an exclamation of surprise.
by jingo! an exclamation of surprise.
– origin C17 (orig. a conjuror's word): from a popular song adopted by those supporting the sending of a British fleet into Turkish waters to resist Russia in 1878.
'jingo' also found in these Oxford entries:

