Green’s Dictionary of Slang

God-dang adj.

a euph. for god-damn adj. (1)

1916		J. Buchan Greenmantle (1930) 389: I’m blessed if I’ll listen to this God-darned stuff. It isn’t delicate.
1931		E. Conkle ‘Madge’ in Botkin Folk-Say 168: Well, I’m a son-om-a-gad-danged sucker!
1964		J. Thompson Pop. 1280 in Four Novels (1983) 376: There was the god-dangest dogfight going on.
1966		‘Tom Pendleton’ Iron Orchard (1967) 221: Goddang clover, looks like to me.
1967		(con. 1920s) J. Thompson South of Heaven (1994) 106: A plumb positive fella like you, that’s plumb positive about things that ain’t a God-dang bit of businesss.
1988		A.W. Garland Women Activists 31: Before you could cook, you had to take a rag and wash the goddang dust off.
2003		R. Diamond Wrestling with God 17: Baby, I don’t want no Goddang sprouts. I want a God-dang steak.