/ ˈdɒgɒn; NAmE ˈdɔːggɔːn/ adjective
[ only before noun ] adverb , exclamation ( NAmE , informal ) used to show that you are annoyed or surprised :
Where's the doggone key?
Don't drive so doggone fast.
Well, doggone it!
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WORD ORIGIN
early 19th cent.: probably from dog on it , euphemism for God damn it .