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1.
A mispelling of care in order to emphasize

A) A lack of caring (to the point of ignoring proper spelling)
B) the redundancy of a situation (given nobody cares)
Someone twitters "I saw someone get hit by a car"
A reply is "I don't caer."

"He insisted Bill Gates is the richest man...and I don't caer."
by Deathwing Clyde March 25, 2010