Dictionary.com
Thesaurus.com

muckymuck

British  
/ ˈmʌkɪˌmʌk /

noun

  1. informal  a person who is or looks very important

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Etymology

Origin of muckymuck

from Chinook jargon; see high-muck-a-muck

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

His uncle's some high muckymuck, and you often see his aunts' and cousins' names in the paper giving teas and receptions and going places.

From Project Gutenberg