Answer: cowabunga

AnswerCrossword Clue
COWABUNGABart Simpson cry
COWABUNGANinja Turtle's cry
COWABUNGASurfer's cry
COWABUNGANinja turtle's cry
COWABUNGASurfer's exclamation
COWABUNGA"Gnarly waves, dude!"
COWABUNGAA word from Bart Simpson