Green’s Dictionary of Slang

goldang it! excl.

a euph. for God-damn! excl.

1872		Schele De Vere Americanisms 595: The Yankee is peculiarly fertile in variations on the name of God, and gives a striking proof of his ingenuity in inventing new forms for the forbidden I swear. He has his by Gorram, by Goldam, and by Goshdang, by the side of the English oath by Golly.
1917		G. Herriman ‘Baron Bean’ [comic strip] Golding it, I’ll make that ‘Baron’ come up.
1953		J. Thompson Savage Night (1991) 28: Goldang it!
1990		Thesman & Turkel Rachel Chance 3: ‘Goldang it!’ he cried. ‘It’s getting so that a man can’t sit down at the table anymore without hooting and hollering starting up and souring the dingbusted milk!’.
2000		W. MacKenna Dust Riders 29: Goldang it! I already put near a quarter bag down your throat!