What is Mucky-muck?
1.
A pompous person of importance (often of imagined and real power). From the phrase "High Muck-a-Muck", itself descended from Chinook Jargon, a pidgin language combining words from English, French, and several Pacific Northwest Native American languages.
The president of our college is a mucky-muck.
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2.
Your boss. Over paid, under worked. All perks, no work. The guy who wears flip-flops to work when you wear steel-toed boots.
The Mucky-muck in Administration wants me to build him a bigger office.