ur son a mum

Best definition
ur son a mum
Single most powerful insult in the universe, stronger than ur brother a mother. Merely uttering it will create a giant black hole that implodes the multiverse and all its parallel dimensions.
Bob: Ur brother a mother

*massive earthquake breaks out*

Carl: Ur son a mum

*All life is annihilated, the universes collide and spontaneously self-destruct*

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