doggone
Concise Oxford English Dictionary © 2008 Oxford University Press:
doggone /ˈdɒgɒn/ N. Amer. informal
▶adjective damned. ▶verb damn (used to express surprise or irritation).
– origin C19: prob. from dog on it, euphemism for God damn it.
'doggone' also found in these Oxford entries:

