when you want to come up with a good comeback but doesn't have time to make one
by WHATS UP FUCKERS March 1, 2019
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a) An insult towards another person when they act smarter
b)somthing to say when theres nothing to say
c) an insult when your pissed at sum annoying mutha fucka
a) emma: nononono, 5% is 0.005 of 100!
sam: ya mum is 5% of 100
b) emma:blahblahblah im hungry
manda: ya mum
c) emma: WAAAAHHH my life sux, NIrvana rock!
manda: ya mum!!!
emma: what about her?
manda: shes ur mum
by Manda June 8, 2004
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A insult often used in jokes such as the following:
Your mums so fat when her peeper went off they thought she was reversing.
by jennifer robinson December 5, 2003
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y=25 a=1 m=13 u=21 m=13
25 1 13 21 13 is a horny bithch
by ian winter goodwin big daddy r September 13, 2003
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an insult or a phrase peoples use, its so funny!
ya mum is!
ya mum did it! ya mum wants ya! i srewed ya mum last nite!
by ya mum rules! November 7, 2003
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When somebody says something really random, a fag normaly a twat, bastard, nerd, geek or just a dickface monkey dick, says: 'Yamum' this normaly means that the fag wants try and be funny, but blatently not.

God: Hello jesus, I would like to know somthink
Jesus: Hey father, what do you want to know?
God: Well, I need you to do somthing for me, very importent, you need to 'gather the kids'
Jesus: YAMUM!
God: Over these past days, I've grown big concers over you.
Jesus: YA MUM HAS GOT CONCERS OVER ME!!! HAHA!!
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Townies think it is the most feared insult in the world or a reply to everything. A common response if a townie says 'ya mum' is to laugh.
by R*chxx June 29, 2004
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