Original Source: Mele Apana (2006)
Urban Dictionary lists Boom Kanani as "The act of booming a kanani, usually said when a situation is triumphed.
Robotic Machine: "You've just won 2948302948 Million Dollars!""
Mele lists the definition as "describes something that is very stunning, wonderful, mind-blowing, awesome, fabulous. If you want to make it even more expressive, add "Ovahlani!" to the beginning.
Example: "Billy V & Mele Apana on Hawaiian 105 KINE is Ovahlani, Boom Kanani!"