you'r

An uncommon misspelling of "your".
It's been seen in 2-3 memes...

For example:

Teacher: David, why did you write about "You'r Momma"??
David: hehehehehehehehehe, joe leprosy

you'r

When an illiterate person can't even spell a simple 4 letter word, for example:

David is currently writing about you'r mother.
David is an illiterate child.