your mom 

The pathetic last resort of someone who can't think of a decent comeback, but is too stubborn to admit defeat.

Guy A:"You're an idiot and dont' know what you're talking about!"
Guy B:"Yeah well... your mom!"

your mom by Canadamus Prime May 25, 2006

Your mom 

An insult that can be used to answer any question.

Bill: "What's as big as a house and is black and blue all over?"

Jim: "Your mom."

Your mom by Tim Allen September 21, 2003

Your mom 

the answer to just about any question for the people you hate... warning my example is only a reason to show people the ultamite comback to your mom

"keep my mom out of this, (point at what what is probably the smallest bit o nads in history... your own)and i'll keep this out of your mom!"

Your mom by Dj Masta Cheez September 26, 2004

your mom 

a commonly used "come back".

thomas:how do you like my new coat? i think it fits me soo good!
sarah:oh god. my boner just died
thomas:YOUR MOM!
sarah:oh. good one.

your mom by kimia delonge. December 22, 2004

Your mom 

Just to add to my previous your mom definition, I will be adding yet another comeback.

Person 1: "Your MOM went to college!"

Person 2: "Oh yeah? Well your OVERLY USED INSULT went to college!"

Your mom by Dj Masta Cheez August 30, 2005

Your Mom 

What I did last night.

I did your mom.

Your Mom by The Guy Who Did Your Mom May 1, 2010

Your Mom 

The overused comeback or answer for pretty much anything. Even if its overused, sometimes, when used correctly, it can still be funny.

Dude #1: Look at the cute kittycat!
Dude #2: Your Moms a cute kittycat.

Your Mom by Concita May 13, 2006