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
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-
henry and brendan - would you like to go upstairs with euans mum
Robbie’s mum is a junkie reprobate that cuts about behind the nisa locals and the jet garages all over Scotland. She loves selling her body for pills and syringes, Robbie’s gran is also Swiss cheese.
Oh my god it’s robbie’s mum!!
She smells like scrumpy jacks, kensitas clubs and herpes!!!! Help!!!
The act of not responding when asked an important question, typically via email or voicemail. Often used in the hope that the problem will just go away.
Damn! My boss's is really giving me the mum act about my raise request.