“How to use Whammy in a sentence” 5th one down is “I love being able to sing for my job and its my passion to so it’s a double whammy”
Edit: funnily enough, keep scrolling and you have the British dictionary definition and let’s face it you are speaking English. There it directly says, “something which has great, often negative, impact”
So right there in your link, it’s not always negative.
I was thinking there needs to be a -scoreboard somewhere.