What in thunder do you mean?
3 seconds sound clip from the Wuthering Heights (1939)) classic radio play.
You can hear this line at 00:32:50 in the radio play.
Quote context
[...]
- For now, I'll say goodnight.
- Thank you, my old friend Cathy, for the warning.
- Edgar, I think you behaved abominably. And you too, Cathy.
- What in thunder do you mean?
- You could at least have been civil.
- You dismissed him as if he'd been a servant.
- Well, do you consider him anything else?
- Yes, I find he's grown fascinating and distinguished.
- Really, Isabella, I hope I misunderstand.
[...]