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One who birthed you.
Ya Mum should have had contraceptives.
ya mum by Ya mum July 12, 2003
a really bad comeback; what you say when you have nothing else to say
person 1: what are yu doin ?
person 2: ya mum
ya mum by anonymous4353785 March 6, 2009
awesome comeback for lowlifes who have no other decent insult to use
Fred: What's the time, man?
Jess: YA MUM!
ya mum by watafuckinghore March 27, 2009
Used after a question, generally as a joke or an "insult"
Ya mum.
Ya mum by lily_wrote_this December 20, 2010
ya mum is what people usually say when they can't think of any comebacks
person1: whatcha doing?
person 2: ya mum