Definition of whammy noun from the Oxford Advanced American Dictionary

 

whammy

 noun
noun
NAmE//ˈwæmi//
 
(pl. whammies)(informal)
 
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an unpleasant situation or event that causes problems for someone or something With this government we've had a double whammy of tax increases and benefit cuts. From the 1950s American cartoon Li'l Abner, in which one of the characters could shoot a whammy (put a curse on someone) by pointing a finger with one eye open, or a double whammy with both eyes open.
See the Oxford Advanced Learner's Dictionary entry: whammy