tarnation
exclamation
[ tɑːˈneɪʃ(ə)n ]
• used to express exasperation, frustration, or incredulity.
• "Tarnation! If Teddy had been elected we'd never have come to this!"
Origin:
late 18th century: alteration of damnation.
in tarnation
• used for emphasis to express exasperation, frustration, or incredulity.
• "what in tarnation is going on over here?"