From a Native American expression for war, to be “on the warpath” is to be exceedingly angry and to be inclined to take some hostile action: “Watch out! John is on the warpath today.”
on the warpath
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on the warpath
Furious and on a hostile course of action, as in When the meat wasn't delivered, the chef went on the warpath. This expression was an English translation of a Native American term that literally means "a path used by a war party." Go on the war path thus meant "go to battle." It was used in this way by James Fenimore Cooper in The Deerslayer (1841); its present hyperbolic use dates from the late 1800s.