kors i taket

Swedish

Literally "cross in the ceiling".

An expression of utter surprise and startlement, usually about pleasant surprises but may very well carry an air of sarcasm or irony.
Synonyms: milda Matilda, milda Amalia

Kors i taket! Är du ur sängen innan lunch, på en lördag?
Oh my gosh! Are you out of bed before lunchtime? On a Saturday?