An expression used to accept a challenge, wage war or defend one's honor by unspecified but extreme/chaotic measures.
In all instances it is a simple way of indicating that come what may, your decision is set in stone.
(exclamation): Originating as a greeting by Chief Thunderthud (the only Indian ever to have a moustache) to the Peanut Gallery on the 50's television program "The Howdy Doody Show", the term was later adopted by surfers in the 60's.
A type of gay orgy where everyone participating is roleplaying Michaelangelo from TMNT. Orange is typically painted around the eyes of each participant either before or during the Cowabunga Cockfest, but not all of these events do this.