big kahuna

[ bigkuh-hoo-nuh ]
/ ˈbɪg kəˈhu nə /

noun Slang.

the most important or dominant person or thing: He’s the big kahuna of a large travel agency.Their scholarship program is the industry’s big kahuna.

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Origin of big kahuna

First recorded in 1955–60; see origin at big1, kahuna
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020