Top definition
The insult of all insults. When you're stuck and have nothing to say, just say 'ur mum'.
"This pizza is still warm"
"Ur mum's pussy is still warm...hurhurhurhur".
by p00_p00 August 30, 2006
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2
The apparent zenith of comebacks, used almost exclusively by 12-16 year olds.
Person 1: You sir, are a veritable nincompoop.
Person 2: ERR UR MUM LOL!1!

'I AD SEX WIV UR MUM LOL'
by Dougal September 27, 2004
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3
the british form of "ur mom", a overused comeback that is funny if used as a joke or your kidding when u say it.
Person:Fuck U!
British Person: I fucked ur mum!

b_i_t_c_h678: i have sooo much homework.
this1person923: ur mom has so much homework! OH! BURN! WAT NOW!?!?!?!
b_i_t_c_h678: wtf lol
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4
wen ur frin bein a cheky cunt n da call of duds u jus sey ur mum
"fukin cheky cunt ur mum is hairy"
by YOOOOOOOOOOOO March 31, 2015
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5
"ur mum" is not ur actualy ur mum but a person that represents ur mum
it is used when you are really stoned or dont hav a good enough come back
Jon: what does my cooking taste like?
Michael: ur mum
by Germans December 11, 2006
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6
a phrase used by someone who has no desent come back or is just a bit of a retard
A: what you doin tonight?

B: ur mum!
by Harry Woodcock January 17, 2008
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7
a word used as a comeback when you have no other comeback to use: a word used to get someone to leave you alone

another term for "your mom"
"Hey what are you eating?"
"ur mum."
by olafsfluffyD December 08, 2015
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