Definitions by The Scope

Cowabunga 

Someone who throws a cow, in a cow throwing contest.
Derived form the sport of cow throwing. The participant in the event.

Bung as in to throw, makes the entrant a 'Bunga'.

The winner of the world cow throwing championships, is crowned world champion Cowabunga.

Cowabunga by The Scope October 5, 2012