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A loud, stupid noise you make when someone says something so dumb it hurts your brain. You might even yell it in their face and call them a donkey.
My friend said, 'I can’t believe he forgot his pants.' I ka-doink-ed him and said, 'You’re a donkey.'
At lunch, my mom said, 'I can’t believe the chicken is missing.' I ka-doink-ed her and threw a taco at her head.
My teacher said, 'I can’t believe you didn’t do your homework.' I ka-doink-ed her and drew a mustache on her face.