Answer: whammo

AnswerCrossword Clue
WHAMMOExclamation of startling abruptness
WHAMMOSound of a collision
WHAMMOAbruptly, in comics
WHAMMOPow!
WHAMMOAll of a sudden
whammoimmense energy; vigor
whammocharacterized by such a strong effect
whammoimpressive verve and energy
whammoabruptly; with startling suddenness
whammo(used to indicate the sound of a blow, collision, falling object, etc.)