Your Mom  

A Pathetic attempt at an Insult, Usually by immature or young people.

Or, Sometimes used to be sarcastic, annoying, or otherwise.
Sometimes followed up with an "OOOH!! U JUZT GOT BURND LOLOLOL" Kind of statement.

Sometimes spelled in chatspeak like:
"UR MOM"
"UR MUM"
"UR MAMA"

Immature/Annoying Your Mom definition:
Kid: "Is there any continent larger than Asia?"
Other Kid: YOUR MOM!! LOLOLOLOLOL
Random Kid: BUUUUUURRRN

The "Pathetic" Definition Example:
Guy: Your such a loser.
Second Guy: Your Mom!
Guy: That comeback is stupid.
Second Guy: UR MOM!!!11!

Sarcastic Definition example:
Dude:Hey Dude what's up?
Random Dude: LOL YOUR MOM.
dude: HAHAHAHA /sarcasm

Your Mom by Natarii Shinichi April 18, 2009

your mom 

the stupidest fucking come back ive heard in my damn life.

x: is it going to rain today?
y: your mom is going to rain today.
**WHAT THE FUCK?
x: what are we doing today?
y: YOUR MOM!
**Last time I checked; my mom wasn't a milf...to anybody.

your mom by ohfuckitsLeigh June 6, 2009

Your mom 

The most versetile joke on the planet.

Teacher: No you can't bring donuts to the christmas party because they're full of sugar. Christopher: Your mom is full of sugar.

Your mom by Punk rock lover March 29, 2010

Your mom's face pouch 

The next response in the progression of the "your mom" insult protocol. Meaningless and yet replete with significance. With proper, patient application, it will lead to blissfully inane repartee.

Speaker 1: Your mom.
Speaker 2: Your mom's face.

Speaker 1: Your mom's face pouch.

Speaker 1: Man, that guy is a dweeb.
Speaker 2: You wanna know who else is a dweeb? - Your mom's face ....

Speaker 1: Your mom's face pouch is a dweeb

Etc.

Your mom's face pouch by moydog April 5, 2010

your mom 

what you say when you get pissed off at someone

your stoopid
YOUR MOM IS STUPIDER!

your mom by Fuck you clit face October 15, 2010

Your mom 

what people substitute in for an answer in third grade, and have absolutely no idea what it means. Commonly used by older people, which is sad, because the only time it was funny was in third grade.
stupid fuckers

mom- what did you do at school today honey?
idiot kid- your mom
mom- im sorry i pushed you out of my vagina

Your mom by AliceSuperstarrr October 9, 2012

Your mom 

A type of joke about a persons mother

Your mom is so fat

Your mom by Kaikaikai February 8, 2015