Derived from the words prerogative, meaning special right, or privilege, and wrong. This results in the word prewrongative which means one's right they have to do something wrong.
Alice: Omg, I can't believe you would sell those Katy Perry tickets instead of use them! This is a once in a life time chance to actually see her live!
Jen: Whatever. It might be a mistake, but it's my prewrongative.