A lame insult, either to the people around you or to the person's mother herself.
1: "dude ur gay"
2: "well ur mom's a man and that makes ur dad gay"
by Schmonkey July 9, 2006
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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.

OR,

Person 1: What does (word) mean?
Person 2: Ur mom.
by flobbles April 29, 2010
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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 21, 2005
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What all “da boyzzzz “ say or to “roast people”
Person 1: Hey I Have -

Person 2: Ur mom
by iiNot_Kay April 7, 2022
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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 5, 2005
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(yer-mom)

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
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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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