Definition of tarnation exclamation from the Oxford Advanced Learner's Dictionary

 

tarnation

 exclamation
exclamation
BrE BrE//tɑːˈneɪʃn//
 
; NAmE NAmE//tɑːrˈneɪʃn//
 
(old-fashioned, especially North American English)
 
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a word that people use to show that they are annoyed with somebody/something Word Origin late 18th cent.: alteration.
See the Oxford Advanced American Dictionary entry: tarnation