A simplistic insult used when all your ripostes have failed. Used commonly at school, chatrooms, and the comments on YouTube.
Ur mom's an example.

The above is how ur mom is used.
by BondFan4518 August 15, 2008
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1)The basis of thousands of bad jokes 2)The basis for millions of sweet comebacks
1)ur mom is so gay, she is a lesbian

2)ur mom is so gay, you masturbate to your mom masturbating about the thought of my mom being gay, while you suck her.
by ftrdrrtgh June 05, 2005
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What people say when the they lack the intelligence to think of any sort of comeback. It's a very redundant phrase. You'll say, "Hey, how's it goin'?" and your mother will be brought into the conversation out of nowhere.

Whomever uses this phrase in an argument, has automatically lost.
Me:Seriously, Napoleon Dynamite sucks.
Them:ur mom
Me: Ohhh, original.
Them:STFU ur momz a ho
Me: At least I got one, motherfucka'!
Them has signed off
by Jon March 07, 2005
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a word for loss of intellignet words or merely an answer to a question you dont know.
"o crap, my pencil!"
"o crap, your mom!"
by Sarah eliz. December 20, 2005
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A funny phrase that is used as an annoying come-back. The phrase, saying it word for word, has no meaning. People usually will say it when they can't come up with a good come-back, or if they don't know the answer to your question.
Person 1: Hey, what do we have for homework?
Person 2: Ur mom.


Person 1: What does (word) mean?
Person 2: Ur mom.
by flobbles April 29, 2010
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a horrible comeback used by total idiots who have nothing better to say. It is often replaced by other nouns in the sentence.
Bob: your an idiot.
Paul Baker: Your Mom's a idiot!

Sally: this homework sucks
Paul Baker: your mom sucks!

Joe: your gay
Paul Baker: Your mom's gay!

by urmomisgay June 20, 2006
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Shorted version of "your mother" (ur mom), generally used as a response to anything on the internet, usually by people of a somewhat simple nature.
(01:31:42) (+andy) yeah, KoRn kinda suck
(01:31:44) (duey) urmom
(01:31:58) (+andy) omg!
by BombBomb October 05, 2003
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