Top definition
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
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2
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
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3
Ur Mom- a common comeback for when someone says....practically anything to you
Person 1:Hey Carl Whats up?
Person 2:Ur mom.

Person A:I had spaghetti last night.
Person B:I had Ur mom last night.

Joe:Im so worn out from basketball..
Carl:Im worn out from Ur mom.
by DtouchmycrumbD January 08, 2006
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4
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
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5
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!"
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6
urmom is generally used as a response to anything on the internet, usually by people of a somewhat simple nature.

lol checkmate
by urmom October 10, 2003
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7
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
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