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B. K. M. stands for 'Butt Kicking Mode' and is basically when you're so angry you'd kick a donkey’s butt just for fun.
My cousin got in B. K. M. after his dog ate his homework.
She was in B. K. M. the whole time she was yelling at the cashier.
He went into B. K. M. when his phone died during a Zoom call.