(be/go) on the warpath informal slang verb phrase
To express great anger and be prepared for an argument or a fight.
Adan is always on the warpath since his defeat at the school contest.
I told my classmates to behave nicely because the teacher goes on the warpath today.
Be careful! Joe seems to be on the warpath today.
To complain that something is unfair or illegal.
Suddenly become crazy or very angry or lose control
To provoke the anger of someone
Used to express your displeasure
The verb "be/go" should be conjugated according to its tense.
The phrase originally referred to native Americans when traveling to an enemy's territory to engage in battle. At first, it was used in a literal sense meaning 'path to war' and can be found in The history of the American Indians by James Adair from 1775:
“I often have rode that war path alone.”
The phrase takes on the figurative meaning since Mark Twain's A Tramp Abroad in 1880:
"She was on the war path all the evening."