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Like all slang it just tends to start with one person and spread so it's very hard to pin point it's origins?

I imagine it was someones response to an insult once, such as "Your a ugly" reply "Your mum's ugly" which would have been simply changed/shortened to "Your Mum".

To insult someones mum is generally a no, no to most people so can be seem as the ultimate insult..

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15y ago

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