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Literally just redneck slang for "don't care"
guy: dude! Stop, you're bout to run into that person's mailbox!
Dude: *hits mailbox* AIN'T CARE.

guy: did you really just make a 5 on your Spanish test? How in the hell..
Dude: *throws paper in trash* Ain't care.
by caytlxn June 10, 2016
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