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A person who's clueless and brainless but still tries to mess with others like they're easy prey
He tried to cheat on the test and got caught by the teacher. Classic ka-can't-think move.
She texted me at 2 a. m. just to say she was bored. What’s wrong with her?
He tried to flirt with my mom and got a look that could kill. He’s a ka-can't-think.