Use when someone is asking you a nosy question or just something stupid as hell.
Reminder: never say this in front of a person who does not have a mother.
SARAH: Hey, whatcha guys talkin' about?
ASHLEY: ur mom.
by Stephie Thong February 27, 2003
Get the ur mom mug.
The thing that manufactured you.

Also a comeback.
guy 1: Dude what made me?
guy 2: Ur mom
by Turtles_ January 29, 2021
Get the Ur Mom mug.
A highly derogatory phrase which replaces the subject of a person's sentence to form a base and unoriginal form of retaliation (for those with difficulty thinking of witty comebacks).
"That was a great sandwich."
"Ur Mom was a great sandwich! Oh! Diss!"
by bamboo shoot October 26, 2004
Get the ur MOM mug.
Something Carl Wheezer tells Jimmy when he asks who Carl wants to fuck and suck
Jimmy: Who do you want to bang

Carl: *Vapes* Ur Mom
by Missionarydog69 November 7, 2019
Get the Ur Mom mug.
A universally acknowledged comeback superior to all comebacks. It can be used in a sentence, or by itself as a phrase.
Doctor: You have chlamydia.
Patient: Ur mom.

Enemy: You look like a dumpster fire.
You: So did ur mom after I fucked her senseless.
by Bubblecove106 September 22, 2019
Get the ur mom mug.
Defenition 1: This word can replace a noun, if done correctly.

Defenition 2: If one can't think of a cool come back. This is the phrase to use.
Guy 1: "Whoa! U made cool sound effects with that paper bag..."
Guy 2: "UR MOM makes cool sound effect!"
Get the UR MOM mug.