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K18 is when you blame the person using the device instead of the device itself. It's like saying the problem is 18 inches away from the keyboard, which is usually where the stupid user is sitting.
My computer crashed again. K18. You're the problem, not the machine.
He said the printer was broken. I said K18. He looked confused and left.
She tried to fix my phone. I told her K18. She said I was a failure.