A Russian. Origin vague or unknown. If not unknown, used to describe Russians living near the Mongolian and Chinese borders, like Irkutsk and surroundings. Not derogatory or an insult term. Pronounced "mahn-KAH-leen."
Also: Manc*, Mankaline
*Used as an abbreviation for Mancalines, or Russians, this time, not people of Manchester, England.
100% Mancaline from Chitinskaya Oblast!