kahuna (kuh-HOO-nuh) noun
1. A priest or a medicine man.
2. An important person (usually in the phrase: big kahuna).
[From Hawaiian kahuna. Hawaiian is a Polynesian language spoken in the Hawaiian islands in the Pacific. The number of native speakers of the language has decreased to just a few hundreds.]
"It's tough being yesterday's man. At a briefing introducing investors to the new AMP boss Craig Dunn, outgoing kahuna Andrew Mohl appeared a little left out."
-- Michael Evans; Marginbet Takes Even Bigger Bet; The Sydney Morning Herald (Australia); Nov 27, 2007.