MUCKAMUCK Meaning of MUCKAMUCK in English [ 'mʌkəmʌk ](also mucky-muck ) ■ noun N. Amer. informal a person of importance or self-importance.OriginC19: from Chinook Jargon, shortening of high muck-a-muck . Concise Oxford English vocab. Сжатый оксфордский словарь английского языка. 2004