ka-doink, boink
A sound you make when someone says something so dumb it’s like they’re talking to a wall. You might even make them do push-ups if they keep it up.
My friend said, 'I can’t believe the sky is blue.' I ka-doink-ed him and said, 'You’re a brainless donkey.'
My mom said, 'I can’t believe the cat is on the table.' I ka-doink-ed her and made her do 10 push-ups.
My teacher said, 'I can’t believe you didn’t bring your pencil.' I ka-doink-ed her and took her pencil and threw it out the window.