Eternal. A Yankee form of swearing.

1

1790.  Why, as I was standing talking with her, a parcel of sailor men and boys got round me, the snarl-headed curs fell a-kicking and cursing of me at such a tarnal rate, that I vow I was glad to take to my heels and split home, right off, tail on end, like a stream of chalk.—Royal Tyler, ‘The Contrast’ (1887), ii. 39. (N.E.D.)

2

1825.  I know your tarnal rigs, inside and out, says I.—John Neal, ‘Brother Jonathan,’ i. 157.

3

1837.  A ’tarnal clean trick was sarved upon a feller in Market Street, a day or two ago.—Phila. Public Ledger, March 6.

4

1846.  

        Jest go home an’ ask our Nancy
  Wether I ’d be sech a goose
Ez to jine ye,—guess you ’d fancy
  The etarnal bung wuz loose!
Lowell, ‘Biglow Papers,’ No. 1.    

5

1848.  The ship drifted on tew a korril reef, and rubbed a tarnal big hole in her plankin’.—W. E. Burton, ‘Waggeries,’ p. 17 (Phila.).

6

1890.  See VARMINT.

7