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Originally, Kahuna was the Hawaiian title for a priest, expert, teacher, and/or adviser, and the term is still used in that context by native Hawaiians. (See ancient Hawai'i) A kahuna nui was a high priest. One of the Kahuna of the then king of Hawai'i (Alapa'i) predicted that a fiery light in the sky would signal the birth of the "killer of chiefs", or ali'i ie: Kamehameha I, the first king of all the Hawaiian Islands .
In beach movies of the 1960s (et seq.) such as Beach Blanket Bingo, the "Big Kahuna" was the best surfer on the beach. This term later made its way from Hollywood into general surfing culture. (See also "The Big Kahuna".)
Kahuna is also a company that make watches, in particular ones designed for the surfers, or people who follow surfer or surf/skate/snow fashion.
In some computer programming shops (for example, IBM), "Kahuna" is a synonym for "wizard" or "guru" (see internet slang).
Kahuna is also the newer version of mail client from Microsoft being developed by the Hotmail team.