WordReference Random House Unabridged Dictionary of American English © 2026
wham•mo
(hwam′ō, wam′ō),USA pronunciation [Informal.]
interj.
n.
adj.
adv.
interj.
- Informal Terms(used to indicate the sound of a blow, collision, falling object, etc.).
n.
- Informal Termsimmense energy;
vigor:a movie with plenty of whammo to please the kids.
adj.
- Informal Termscharacterized by such a strong effect:a show with a whammo ending.
adv.
- Informal Termswham.
- wham + -o 1930–35
'whammo' also found in these entries (note: many are not synonyms or translations):