It's a way of saying "your mom" or "your mother," which is an extremely weak insult showing a lack of creativity on the part of the user. Most of the time its use does not make contextual sense.
It just mean mum
"Mum" is another word for silent.
It can refer to a mother or to staying quite and not saying anything about something.
My mum
you mum
Yes, Mum and Mom mean the same. Your mother. Mum is more usual in the UK, Mom in the US
agda means ya mum agda means ya mum
It means Mum
ma maman
mum
Type your answer here... your mum
Ya mum.