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G. A. T. S. is like H. A. G. S. but way worse. It means you're getting your ass kicked this summer and you know it.
My cousin wrote G. A. T. S. in my yearbook. I'm gonna make him pay.
I saw my teacher write G. A. T. S. in my yearbook. I'm gonna fail.
My best friend wrote G. A. T. S. in my yearbook. I'm gonna beat him up.