A phrase used when somebody doesn't know any good comebacks.

Also used as part of a joke

The woman who gave birth to you
Person1: You're so gay
Person2: Your mom

Your mom's so fat she stepped in the ocean and said 'Who put this puddle here?'

Person: I'd like you to meet your mom, Casie
by Stepheli November 10, 2005
an abstract concept loosely affiliated with notions of the intended audience's maternal figure.

normally expressed as an intended slight on said maternal figure. often serves as indication of the end of a conversation.
X: That is one very fat farm animal.
Y: You're a fat farm animal.
X: I'll show you a fat farm animal
Y: You're going to be a fat farm animal if you dont shut up
X: Oh yeah, your mom's a fat farm animal OHHHHH!
by The Snatch August 06, 2005
a phrase for use of backtalking and a good way to diss someone
-Man, you're ugly!
Yo mama ugly!

-I took him into the bedroom
I took your mom into the bedroom
by Pokey December 03, 2004
Probably the most over-used, unintelligent and pathetic comeback phrase and/or insult ever imaginable in all of humankind.

Not only is the useage commonly meaningless and inaccurate, it's a piss-poor and half-assed attempt at trying to offend someone who is clearly clever and better at insulting you than you are at insulting them.

The term is also pretty annoying, petty and pitiful.

Person #1: I see that you are overweight, unlikeable and have a horrid personality... Who taught you to be the way that you are, you skanky slut?
Person #2: Your MOM!
Person #1: I suppose that makes sense, since you've never met with my mother or have ever been acquainted with her. Whatever. You suck at making insults.
Person #2: Um... shit, I guess you're right.
by Brandi8888 October 04, 2011
1. The woman who gave birth to you and/or raised you.
2. An all-purpose insult, used to end a conversation, cover for the fact that you can't think of a witty comeback, or pwn somebody. When used in this sense, the implication is that your mom is sexually promiscuous, of below-average intelligence, grossly overweight, or any combination thereof. Does not necessarily have to make a lot of sense, e.g. 'Your mom goes to college!'
3. A ho.
Dick: '...therefore, your argument can be proven irrefutably incorrect.'
Jane: 'Your mom!'

Jane: 'Ew, this pizza tastes weird.'
Dick: 'Your mom tastes weird.'

Dick: 'Where's the remote control?'
Jane: 'I left it in your mom.'

Stephen Hawking: 'The whole history of science has been the gradual realization that events do not happen in an arbitrary manner, but that they reflect a certain underlying order.'
Dick and Jane: 'Your mom doesn't happen in an arbitrary manner!'

by Something_Vague June 16, 2007
worst comeback ever.
Steve: Your a douche

Bob: your mom is a douche!
by ghks1117 September 17, 2009
A phrase used when you don't know or want to answer a question, to be a complete asshole, to try to be funny when you're really not, or just feel like using it. Sometimes people in the background add the "OHHHHH" sound effect as well, depending on the situation.
Example 1
Dude: "Yeah so what's the homework tonight?"
Dude 1: "Your mom, bitch"
by Viagra Bread May 22, 2008
my ride last night... ask your dad
"your mom rides smoother than a limousine"
by danisoccergirl9 November 05, 2007

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