*you're

Let's discuss.

'Your' signifies ownership or relation, which refers to something owned by someone, a title, or a friend/relation.

'You're' is an abbrevation of 'you are', which is what you'd say when speaking to someone about who or what they are, be it an insult, praise, fact or random statement.

*you're.

Your;

"Your computer rocks!"
"Your mother is a slutwhore!"
"Your criminal status is unacceptable!"

You're;

"You're a moron."
"You're fantastic!"
"You're a normal person."
"You're gay."

I request that you people learn what I have just explained on the grounds that

IT IS NOT THAT FUCKING HARD.

you'r

Ambiguous replacement for both your and you're used to mask the user's ignorance of proper usage.
It can be easily passed off as a typo because depending upon context it can be assumed that either an apostrophe was accidentally added or an "e" was forgotten.
The use of this word allows the user to appear cavalier as opposed to ignorant.

You'r disrespecting the English language by so blatantly misusing 'your' when you clearly mean 'you are.'

you're a

A surefire method to make a joke out of nothing, by taking the last thing someone says to you and prefacing it with "you're a". Best if done repeatedly amongst like-minded folk over a long, long, long period of time.

"I'm going out tonight, but it's just a work thing."
"You're a work thing."

"That guy who comes coming into my cubicle is barking mad."
"You're a barking mad."

you're

The word that most people don't know exists

John: your stupid
Ben: *you're. Who's stupid now? you fucking idiot
John: *dies*

you're

A word that I wish people would actually use when they're supposed to.

<C> Your dumb!
<JB> It's "you're". Idiot.

YOU'RE a...

A pretty fun effing way to talk back to one's mother, no matter what she says. Use with discretion.

Mother: "Are you comfortable enough, sweety?"
Unbelievably rebellious teenager: "Are YOU comfortable enough?!"

Mother: "He's the devil."
Teen: "YOU'RE the devil!"

Mother: "I went shopping."
Incredible Edible Rebel: "YOU went shopping!!!"

You're

What retards think "your" is spelled, but they're too thick to get it through their skulls.

You're mom.