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whammo

[hwam-oh, wam-oh]Informal.
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interjection
  1. (used to indicate the sound of a blow, collision, falling object, etc.).
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noun
  1. immense energy; vigor: a movie with plenty of whammo to please the kids.
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adjective
  1. characterized by such a strong effect: a show with a whammo ending.
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adverb
  1. wham.
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Origin of whammo

First recorded in 1930–35; wham + -o
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Word Origin and History for whammo

exclamation signifying violence or surprise, 1932, from wham (q.v.).

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Online Etymology Dictionary, © 2010 Douglas Harper