Definition of whammy noun from the Oxford Advanced Learner's Dictionary

 

whammy

 noun
noun
BrE BrE//ˈwæmi//
 
; NAmE NAmE//ˈwæmi//
 
(pl. whammies)(informal)
 
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an unpleasant situation or event that causes problems for somebody/something With this government we've had a double whammy of tax increases and benefit cuts. Word Origin 1940s: from the noun wham + -y; associated from the 1950s with the cartoon strip Li'l Abner, in which the hillbilly Evil-Eye Fleegle could “shoot a whammy” (to put a curse on somebody) by pointing a finger with one eye open, and a ‘double whammy’ with both eyes open.
See the Oxford Advanced American Dictionary entry: whammy