The act of damning or the condition of being damned.(noun)
Used to express anger or annoyance.(interjection)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "tarnation" in a sentence
"What in tarnation does a fella need these doggone infernal machines for?!?"
"Well how in tarnation am I supposed to know what monster is made of?"
"Are You????? moaaahaahaaaaaa. and what the hell in tarnation does bastion, anyways,."