Who in 'tarnation let a gal like that go out in a boat alone, and without airy oar?
"What in tarnation set the beasts onto us," inquired Shorty wonderingly.
But what in tarnation the stakes are that she's after is more'n I know.
"And he's tarnation sorry for himself too, you bet," added the Texan.
"It's a tarnation lie, that's what it is," said the stranger vindictively.
What in tarnation has that got to do with stealing my chickens?
None at all, but I'd have been a tarnation sight more presentable if somebody had taken me in hand and licked me into shape.
And then the noise—I could not make such a tarnation outcry to save my life.
I is goin' where Scottie an' the Parson goes; but where in tarnation is ye goin', and what for?
Then, said the first speaker, what a tarnation fool he was, not to stop on shore.
[1790+; a euphemistic alteration of damnation, apparently influenced by obsolete US slang tarnal damned, an alteration of eternal]