One who doggones; something or someone that is doggoned or worthy of being cursed (archaic/rare).
From doggone (the verb or adjective, from God damn) plus the agent noun suffix -er, though this form is quite archaic and rarely used.
This word is so rare that it's barely attested in modern English, but it shows how productive the -er suffix is—you could theoretically make an agent noun from almost any verb!
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