Answer: durn

AnswerCrossword Clue
DURNMortimer Snerd expletive.
durnto damn (to curse (to invoke evil upon))
durnto curse; damn
DURN"Dang it!"
DURNShucks
DURNRats!
DURNRelative of drat
DURNCowpoke's oath
DURNRustic cuss word.
DURNRural "Rats!"
DURNFarmer's expletive.
DURNKin of "Heck!"
DURN"Yer .. tootin'!"
DURN"Yer ... tootin'!"
DURN"Heck!"
DURN"Doggone!"
DURNKin of "Shucks!"