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Noun. A term used as a response to any question. Note that it does not have to be used to insult ones maternal figure, but rather piss the target off because they here you use the term daily.
target: "What are you going to do with that whole bottle of rum??"

you: "UR MOM"
by Puzzler11 July 13, 2009
8 5
a cliched insult used by unorigional and moronic douche bags
"i want to kill you for being a total idiot."

"well, uh, ur mom!"
by m0rph3us August 15, 2004
1121 449
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 25, 2004
736 223
can either be used as a random word which people seem to think witty and bugs the hell out of people, or, obviously, your mom
Bob: What are you doing tonight?
Joe: Ur mom
by i luv jesse mccartney April 25, 2005
527 123
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!"
by Kevin N' Kyle and Company May 01, 2005
556 179
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
406 122
The Universal answer to anything and everything.
"What is the meaning of life?"
"ur mom"

"What time is it?"
"ur mom"

"What's 2+2=?"
"ur dad... errm, I mean mom."
by Lanan September 24, 2005
456 211
two words that can answer any questions.
joe: hey!
bill: hey!
joe: how r u?
bill: ur mom knows how i am. . .
joe: can u stop?!
bill: ur mom wants to stop . . .
joe: do you hav herpes?
bill: ur mom has herpes . . .
joe: shut up!!!
by Cami!!! September 15, 2006
286 137