from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A normally peaceful person who has become suddenly and uncharacteristically angry.
First attested in 1826. From French mouton enragé ("angry sheep"), a nickname given to French politician Nicolas de Condorcet by Turgot. Formed from mouton ("sheep") + enragé, past participle of enrager ("to enrage"). (Wiktionary)