mom = made of money

What m.o.m. means

Me: mum, can i have robux please
mom: no
me:why mom?
mom: no robux for you, until you grow up and you can buy robux
me: mom = made of money
mom: your grounded for 1 year
me: that's what m.o.m. means
mom: your grounded for 20 years
me:i'm 20 years old
mom: don't care = don't ask