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Word used by the Teenage Mutant Ninja Turtles meaning "Turtle Power" or "Turtle Force".
"Kowabunga!" said Donatello after seeing his enemies.
kowabunga by Flaepru December 5, 2007
wacking off with the pinky and the thumb extended in the kowabunga hand signal
last night i was feelin a little crazy and decided to go with the kowabunga for a change
kowabunga by jimi dean June 17, 2006
The anus of a bovine!
Dude did you see the asshole on that one cattle?

Yeah, that's a serious Kowabunga (cow bunghole!)
Kowabunga by Bovine Herder September 23, 2009
Kowabunga.
Someone jumping off a cliff: “Kowabunga!!!”

Kowabunga Fap 

The act of masturbating in the tune of the theme song of Teenage Mutant Ninja Turtles. Finally you ejaculate as the theme song says "Turtles in a Half Shell."
Me and my girlfriend were messing around and I "Kowabunga Fapped" in her face.
Kowabunga Fap by Nukeman June 15, 2010

Kowabunga Rage Crew 

An Emerging Pop-Rock Band Originating Out Of New Jersey. They Consist Of Pistol Pete, Shark Attack, And D.J. BT DUBS. They Have Written Hit Songs Such As S-E-X-T-I-N-G And Burn Down The City (Rock And Roll). You Can Find Them At Their Website: myspace.com/krcmusic.
Kowabunga Rage Crew Says: "Send Me Your Naked Pictures!!!!" In Their Hit Song S-E-X-T-I-N-G
Kowabunga Rage Crew by Jason XX August 8, 2009