Back in my childhood my mother - or indeed any adult, if there were children present - would never say "shit". "Bugger" was her worst, but the occasional "bloody" did slip out. My father didn't swear in front of us. If we heard an adult say "shit" in our presence we knew things would go rapidly downhill, usually to our detriment.

If she was really provoked she would say "oh....sugarmagundy!" I have no idea where that came from, but it was reserved for times such a bowl full of cake mix being dropped on the floor.