@eclectech I think there might be no German equivalent, all I can think of is actually just "what the fuck/hell/...". So I tried to come up with a direct translation, and I think "um Fickeswillen" is a good thing to say in a dismayed way. Although "fickhalber" or "fickeswegen" sound fun too, but they're more practical words, more of a literal "I did this for the sake of fuck".