A typical childish insult from teenagers 11-16. Sometimes, because they've got nothing else to say, or because they think it makes them look 'big'
E.G. 1:

Jenny: *Yawn*

Shane: You tired?

Jenny: Yeah.. a bit.

Shane: Well your mum wasn't tired in bed last night!

-------
E.G. 2:

Jenny: You're so childish!

Shane: No I'm not, you motherfucking whore.

Jenny: Prove it then, cuntfaced frog featured toadostical moronized mong penguin tatoo moose!!!!

Shane: ...Ok? Go fuck your mum, slut.
by Mongifed June 12, 2008

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A comeback that can be funny if you use it at the right time, but not funny if you overuse it.
Good example:
Antonio: Who's doing cork? (For geography project)
Georgia: You mum is!
Mary: Is your dad's name cork?

Hahahahaha.

Bad example:
Person 1: Hey, you penis is so small you can hardly see it!
Person 2: Your mum.

Not funny :|
by Georgia--xo-- September 02, 2007

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Not only an insult which can be hilarious if used in the right context, but also another way of saying "shut up" used perfectly by Lawrence Whale.
"You look stupid today"
"Yeah your mum"
"No really you do"
"Shut your mum!"
by Robert Lewis March 18, 2005

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Surely refers to the fact your mum is easy, or suggest that the person saying it has indeed slept with your mum
Person 1 "Shut up, your such an idiot"
Person 2 "your mum"
by jenm December 04, 2004

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good fuck _b
<cohnsy> lant your mum eats too much
by cohnsy March 25, 2003

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a great word, can be said anytime and never gets over-used.
D'you wanna come over my house tonight?

Your mum wants to go to your house tonight!

You Suck!

Your mum sucks!
by urmumgotowned March 27, 2008

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your mum insults - nottingham style!! keeping it real - your mum keeps it real. It smells of fish in here - your mum smells of fish. Tell your mum I wont be coming round tonight because I am doing your gran. Later

I saw your mum walking down the road kicking a cardboard box, I said what you doing? She said - I is moving house, innit!?

I saw you mum walking down the road with a wok on her head and a wooden spoon in her hand, I said what you doing? - She said I is playing Robocop, innit!?
by George Chelle February 22, 2008

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