Green’s Dictionary of Slang

darnation! excl.

a euph. for damnation! excl.

A.B. Lindsley Lover & Friendship I i: Darnation! says ’e, in a torne down passion — dont swear so, capun, says I (cool as a kewcumber).
[US]S. Woodworth Forest Rose I ii: Darnation! If I had not been bussing Lid Rose!
[Scot]Caledonian Mercury 20 Jan. 4/5: Darnation! hear that now.
[US]J.F. Cooper Satanstoe I 68: ‘Buttermilk, by Jingo,’ exclaimed the disappointed pedagogue. Saint Jingo was the only saint, and a ‘darnation,’ or ‘darn you,’ were the only oaths, his puritan education ever allowed him to use.
[US]Portage Sentinel (Ravenna, OH) 7 Jan. 1/3: ‘Darnation to golly gracious!’ says he.
[US]G.W. Harris ‘Sut Lovingood at Bull’s Gap’ N.Y. Atlas XXI Nov. in Inge (1967) 144: Darnation! how they reaches forard towards better things.
[US]Schele De Vere Americanisms 594: Darn and darnation, said to be American inventions, and with their superfluous r betraying Southern manufacture, belong to that painfully numerous class of half-veiled blasphemies which abound in all parts of the United States and in all classes of society.
Dly Gaz. for Middleborough 19 Sept. 4/3: Oh! Oh! Darnation to fish hooks! what’s been going on here?
[US]J.W. Carr ‘Word-List from Hampstead, N.H.’ in DN III iii 185: darnation, interj. Softened form of damnation. ‘Darnation! Why couldn’t he stay away.’.
[Scot]Eve. Teleg. 30 Nov. :