cowabunga 

(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.

Chief Thunderthud: Cowabunga, peanuts!
The Peanut Gallery: Cowabunga!
Surfer: Cowabunga, dude!

cowabunga by Vermont Ferret August 8, 2005

Cowabunga 

When you pull a girls bloody tampon out and swing it like a nunchuk and hit her in the face with it.

I had Saam in the shower last weekend, she had a tampon in so I gave her the cowabunga

Cowabunga by Browniebaby July 22, 2017

cowabunga 

An exclamation of rejoice from the early 1990s. Usually uttered by teenagers wearing neon colors. Brought to popularity by the ever-so-famous Teenage Mutant Ninja Turtles.

Leonardo: The pizza just got here!
Michaelangelo: COWABUNGA dude!

cowabunga by quirky sally October 12, 2003

COWABUNGA 

60s SoCal surfer slang popularized by artist Matt Goening's animated skateboarding cartoon character Bart Simpson, son of Homer "Doh!" Simpson, on the still running ― 20+ years ― "The Simpsons" TV show.

Of course, surfers picked word up ― as Vermont Ferret wrote ― from Chief Thinderthud's greeting and his peanut gallery's response on the old time (1950s) children's TV show "Howdy Dowdy," an eponym for its cowboy manikin. Back then, on old corny Westerns, an Amerindian's greeting was stereotypically, "How!" to be rejoined with a "How!" So How morphed into Cow and an "abunga" was added for silly kid ― or those with Peter Pan syndrome ― fun.

Cowabunga, dude!

COWABUNGA by mpcAstro September 2, 2012

cowabunga 

a cool word used mostly by surfers to greet each other, say they are having a good time or just happy.

Kelly Slater- "Cowabunga!"
Laird Hamilton- "Totally, dude, this party is awesome!"

cowabunga by Kewl Chick S July 7, 2009

cowabunga 

Positive, Good, Great, in an aspect greater than 'cool'.
mostly used by headbangers, metalheads, skaters, surfers, and ninja turtles.

Cowabunga dudes!

cowabunga by Darrel March 20, 2003

Cowabunga 

A greeting used by only the most intelligent. Often said or used while (orgasming) or (shooting the goo)

Cowabunga dude.

Cowabunga by 3 pac January 28, 2019