I hope your mum's ok and that's it's nothing to be worried about
Just to cheer you up though, I once shouted 'Oi S***head' jokingly to my hubby at a biker rally.
There were at least 30 Hells Angels and other bikers who turned round and said almost to a man, 'Yes my love'?
As
@izzzi says it can be a tongue in cheek term of endearment.
I hasten to add though, I never normally swear, and when I do everyone just falls about laughing. Apparently it just sounds so wrong coming out of my mouth.