Definition of "damme"

And now, have at the Ministry, Damme!

1809, James Gillray, Pillars of the Constitution

"Damme, sir," said the major, "there is no use in disguising a fact. Joe is blunt, sir. That's his nature."

1846 October 1 – 1848 April 1, Charles Dickens, Dombey and Son, London: Bradbury and Evans, […], published 1848

I'm very sorry to disparageA humble foremast lad,But to seek your captain's child in marriage,Why damme, it's too bad!

1879, W[illiam] S[chwenck] Gilbert, Arthur Sullivan, composer, “Act ii”, in H.M.S. Pinafore; […], San Francisco: Bacon & Company, […]