This phrase is used (mostly in England) as one of the best way to end a conversation. The reason for this is because there is no way to reply to it.
Example 1:
Joe: What do you want for dinner tonight?
Jeff: Ur mum
Example 2:
Bob: Harry you’re so ugly
Harry: Ur mum
Example 3:
Teacher: Harvey, did you do your homework?
Harvey: No
Teacher: Why not?
Harvey: Ur mum
Joe: What do you want for dinner tonight?
Jeff: Ur mum
Example 2:
Bob: Harry you’re so ugly
Harry: Ur mum
Example 3:
Teacher: Harvey, did you do your homework?
Harvey: No
Teacher: Why not?
Harvey: Ur mum
by Ur mum definition February 18, 2022

A sweet little lady who loves taking nuts to the face from shredded black dudes who are hung like a horse
"Damn look at that milf over there!"
"OH! That's "Morgans mum" ! She loves penis"
"I'm finna go over and give her the BIDNESS!!!!!!"
"OH! That's "Morgans mum" ! She loves penis"
"I'm finna go over and give her the BIDNESS!!!!!!"
by Dick Butkusssssssss January 22, 2014

by TodezPlayz September 11, 2020

the words 'ur mum' are the greatest words mankind has ever invented. There is so much emotion in these beautiful words I cannot even describe how it makes me feel when someone whispers these words Into my ears it makes me feel all buzzy and tingly it is a sensational feel coursing through your body. the maker of these words a quandarius figgle bottom the 3rd now he is the most gorgeous person to ever set foot on this earth gosh I wish he would marry me.
jack: Hey christian ur mum is a fucking ugly whore.
Christian: shut up cuz guess what I had intercourse with ur dad last night
jack: wha-
Christian: shut up cuz guess what I had intercourse with ur dad last night
jack: wha-
by Yo_mamaOffical June 3, 2022

The one woman /girl /lady / best friend any daughter should have . Will not cause heart break and is there for you .
by L.a.r.a May 25, 2018

by Kieronsmumsflaps January 31, 2023

Andrea is my mum she's the best she's caring,loving and she'll always put others before herself I love my mum and I might not show it mum but I love you
by Dyl.ross8420 September 23, 2020
