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K. A. B. F means your knees give out and your ass gets the full brunt of the fuck. It’s the worst kind of humiliation.
My buddy got K. A. B. F when he tried to dance in front of the whole school.
She got K. A. B. F during the surprise birthday party because she didn’t know what was coming.
He got K. A. B. F after eating three burgers and a pizza in one sitting.