"Ki tudja miért?"

Translation: Who knows why?

[RO_4_PM]

why is the definite conjugation used here?

[hatcher]

Ki tudja (azt, hogy) miért?

[qorilla]

This needs a comma: "Ki tudja, miért?"

[PekoBodin]

Is this rhetorical question like in Slavic languages, used in sentences like "I broke a leg, who knows why is that good" meaning something like "there must be some reason I broke a leg, maybe something good will come out of this"? Or is it really a question?

[BrandedBastard]

both :)