Damned or cursed (a mild euphemistic oath); expressing mild annoyance or frustration.
From 'God damned' contracted and euphemized through folk etymology, where 'God' became 'dog' and 'damned' became 'goned,' as a way to avoid swearing.
This is a brilliant example of a euphemism that evolved by accident—saying 'doggoned' instead of the curse word was so clever that it became standard mild swearing, especially in American English!
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