Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • interj. Slang Used to indicate the startling abruptness of a sound, action, or event: "The alarm goes off and—whammo!—we're all at our assigned stations” ( Meg Greenfield).

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • interj. used to emphasis the suddenness of an event

Etymologies

Alteration of wham.
(American Heritage® Dictionary of the English Language, Fourth Edition)
From wham (Wiktionary)

Examples

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