From Longman Dictionary of Contemporary Englishwhammywham‧my /ˈwæmi/ noun [singular] informal 1 → double/triple whammy2 → put the whammy on somebody
Examples from the Corpus
whammy• Is he aware that the Labour party will put up both - a double whammy?• In the political parlance of 1992, I suppose it might be said that Mr Platt has given himself a double whammy.• Economic impudence plus political insensitivity combine to make a Kinnockian double whammy that I will vote Tory to avoid, however unenthusiastically.• Anyway, in a showbiz double whammy the boys with the buttocks have been talking to Bryan Burnett.• After the double whammy of rugby in Johannesburg and rowing with Redgrave, though, I more resembled a wizened old man.• We've each had our hot streaks, I won't deny: the whammy has changed hands many times.• Soften them up, then hit them with the whammy.Origin whammy (1900-2000) Probably from wham 