whammo


wham·mo

W5112400 (wăm′ō, hwăm′ō)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).
[Alteration of wham.]

whammo

(ˈwæməʊ) interj a variant form of wham2