whammo

[hwam-oh, wam-oh] /ˈʰwæm oʊ, ˈwæm oʊ/
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.
wham.
Origin
1930-35; wham + -o
Examples from the web for whammo
  • It's edgy without making you dizzy, graphic without inducing nausea, and always has an emotional whammo at the end.
Word Origin and History for whammo

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