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An insult aimed (sometimes pointlessly) towards your mother usually to make you feel embarrased and uncomfortable. It can also be used as a last gasp insult, where the speaker runs out of ideas and consequentally insults your mother.
Mother Insult eg.

Person 1: "I like this new show on tv."
Person 2: "I like your mum."

Man 1: "I like the taste of this."
Man 2: "I like the taste of your mum."

Guy 1: "I was hit hard in football the other day..."
Guy 2: "Your mum was hit hard the other day."
Guy 1: "Really? By who?"
Guy 2: "By me."
Guy 1: *Uncomfortable shiver*
by swish555 May 16, 2009
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