The term ya mum is a slang for an insult your mother. It is usually used by street gangsters and is considered "gangsta" (as one can see the ending of both words is the same ends in a, even though it is not correct).
Ya mum! Ya mum! Ya mum! Ya mum! Ya mum! Ya mum! Ya mum! Ya mum! Ya mum! Ya mum!
ya mum ya mumya mum ya mumya mum ya mumya mum ya mumya mum ya mumya mum ya mumya mum ya mumya mum ya mumya mum ya mumya mum ya mumya mum ya mumya mum ya mumya mum ya mumya mum ya mumya mum ya mumya mum ya mum
ya mum ya mum ya mum ya mum ya mum
Ya Mum Ya Mum Ya Mum Ya Mum Ya Mum Ya Mum
ya mum
ya mum
ya mum ya mum
ya mum mum ya hwehehwhe
there is not a organism in the whole universe as heavy as ya mum
agda means ya mum agda means ya mum
It's Ya Mum by Ya mum. LOLZ!
1 hour and 10 minutes