narcoEnglishOxford New American Dictionarynarco /ˈnärkō, ˈnɑrkoʊ / ▸ noun (plural narcos) US informal narcotics; illegal drugs: [as modifier] the multi-billion dollar narco trade. ▪ a dealer in drugs: political bosses who may have links to the narcos. – ORIGIN 1950s : abbreviation of narcotic.