Green’s Dictionary of Slang

(US) a euph. for damned adj.; note unusual v. formation in cit. 1868

1850		W.K. Northall Life and Recollections of Yankee Hill 160: Zachariah Stanhope, a consarned dirty little rascal, who swept our historical room and made the fires, bust right eout intew a snigger.
1851		Southern Literary Messenger Mar. n.p.: That’s a concerned ugly fix, and how we’ll ever get out of it is more than I know.
1868		G.W. Harris ‘Well! Dad’s Dead’ Knoxville Daily Press and Herald II 15 Nov. in Inge (1967) 210: Consarned him, he’s at his old tricks agin.
1872		Schele De Vere Americanisms 592: Concerned, in New England always pronounced consarned, is a popular euphemism for ‘damned’.
1878		F.H. Hart Sazerac Lying Club 203: I’ll bet forty-five to fifteen I can lick the stuffin’ out of the doggoned, ornery, consarned critter.
1891		M.D. Landon Eli Perkins: Thirty Years of Wit 284: You are a consarned old Nova Scotia liar!
1899–1900		C.L. Cullen Tales of the Ex-Tanks 154: I wisht these consarned, lazy store-folks ’ud [...] open up business.
1907		D. Stewart Shadows of the Night in Illus. Police News 27 July 12/2: ‘The consarned pirate has sent Percy to Davy Jones’.
1911		C.M. Payne ‘Bear Creek Folks’ [comic strip] This is the roughest consarn road I ever did ride on! [...] That consarn yap never even told me I was off the track!
1945		E. Wilson 11 Jan. [synd. col.] Maybe I’ll ride in one of them consarned rocket ships.
1953		Mad mag. Jan.–Feb. 28: Consarned hoss!
1964		J. Thompson Pop. 1280 in Four Novels (1983) 389: You answer me, you consarned idjit.