whammo

[hwam-oh, wam-oh] Informal.
interjection
1.
(used to indicate the sound of a blow, collision, falling object, etc.).
noun
2.
immense energy; vigor: a movie with plenty of whammo to please the kids.
adjective
3.
characterized by such a strong effect: a show with a whammo ending.
adverb
4.

Origin:
1930–35; wham + -o

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Etymonline
Word Origin & History

whammo
exclamation signifying violence or surprise, 1932, from wham (q.v.).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
It's edgy without making you dizzy, graphic without inducing nausea, and always has an emotional whammo at the end.
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