narcoEnglishOxford Dictionary of Englishnarco /ˈnɑːkəʊ / ▸ noun (plural narcos) US English informal narcotics; illegal drugs: [as modifier] the multi-billion dollar narco trade. ▪ a drug trafficker or dealer: political bosses who may have links to the narcos. – ORIGIN 1950s: abbreviation of narcotic.