The ultimate insult that can work on anything just by slightly altering someones sentence with 'ur mum' .it can also be written as 'ur mom'.
person 1: "you're fat"
person 2: "ur mum is fat"
person 1: "that insult is so unoriginal"
person 2: "ur mum is so unoriginal"
person 2: "ur mum is fat"
person 1: "that insult is so unoriginal"
person 2: "ur mum is so unoriginal"
by The Epicster May 3, 2020

Person 1:Hey Carl Whats up?
Person 2:Ur mum
Person A:I had spaghetti last night.
Person B:I had Ur mom last night.
Joe:Im so worn out from basketball..
Carl:Im worn out from Ur mom.
Person 2:Ur mum
Person A:I had spaghetti last night.
Person B:I had Ur mom last night.
Joe:Im so worn out from basketball..
Carl:Im worn out from Ur mom.
by Mommy Milkiess December 6, 2021

literally every kid on xbox when they lose.
If you say this you're probably a spoiled British (because of the mum) brat between the ages of 9-12.
If you say this you're probably a spoiled British (because of the mum) brat between the ages of 9-12.
by Oven-Mitt March 12, 2021

by urnan dictionary 12329 July 7, 2020

Probably one of the most hurtful insults that can cross your tongue. Used only in extreme circumstances to completely obliterate the other person.
by UrMumGay123456789 January 13, 2022

by laxatives4life January 22, 2023
