Green’s Dictionary of Slang

Christopher Columbus! excl.

a euph. for Christ! excl.

1876		Besant & Rice Son of a Vulcan II 13: Whurroo! Christopher Columbus!
1895		J.S. Wood Yale Yarns 64: I got up on the forward wheels [...] when—Christopher Hemlock! Two coppers grinning like a pair of bloomin’ hyenas jumped forward.
1945		G. Fairlie Capt. Bulldog Drummond 206: ‘Chrisopher Columbus!’ said Hugh Drummond.
1953		L. Doyle Back to Ballygullion 178: ‘Oh, great Christopher Columbus,’ laments Uncle Joe.