Chow Mum
Automatic response to any open-ended question, intended to divert the subject of the conversation to the initiator's mother. A derivative of 'your mum'.
Ed: I told you to meet me at the basketball court at 4, what were you doing?
Albert: Chow Mum.
Ed: Yeah, that's funny. Where are you going after we play?
Albert: Chow Mum's house.
Albert: Chow Mum.
Ed: Yeah, that's funny. Where are you going after we play?
Albert: Chow Mum's house.