when someone has nothing to say to a sentence, they say the phrase "ur mum" or a "ur mum" joke since they cant think of anything else with their nincompoop brain.
"Ugh i wish you would listen to me, even my mom listens better" "probably because ur mums so fat and her ears are so big even when shes tired of your bullshit she still has to"
by the real fish comfirmed May 28, 2023
ur mum is pretty much ur mum aka also known as ur mother and ur mum is a very common occurrence in a conversation with your friend
by mr super leng guy April 05, 2022
by Caverace November 11, 2020
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 04, 2020
by VoidVortex November 24, 2022