slang An especially important, influential, and authoritative person, especially someone who is overbearingly or arrogantly so. (Sometimes shortened to simply "muckamuck.") "All hail the high muckamuck," Jerry muttered under his breath as the dictator's motorcade rolled by. We're just waiting for the high muckamuck to give us the green light before we get the project started.

slang An especially important, influential, and authoritative person, especially someone who is overbearingly or arrogantly so. We're just waiting for the muckamuck to give us the green light before we get the project started. "All hail the muckamuck," Jerry muttered under his breath as the dictator's motorcade rolled by.