I am also from Brum, and according to reliable sources (@Barry Haynes) , also smoking hot. I always wrote Mum, but pronounced it Mom.
Yes I can confirm smoking hot but bloody hard to understand, that bloody brummie accent, nearly as bad as Geordie
My mother in law was dragon - I even had her down in my phone as that and yes she did know we called her that
It's getting edgy....the Brummies are revolting... https://www.iambirmingham.co.uk/2018/03/09/brummies-miffed-lack-mom-greeting-cards-mothers-day/
Some might say this is surely a trivial matter, but it’s the thin end of the wedge really. You let them get away with writing mum in Brummie greetings cards, the next thing you know, they’ll be rounding Brummies up in brain washing centres and making us say “barth “ instead of “bath” and “five” instead of the correct pronunciation, “foive”