你是我的小笨蛋你是我的小傻瓜
[nĭ shì wŏ de xiăo bèn dàn nĭ shì wŏ de xiăo shă guā]
The phrase translates to 'You are my little idiot; you are my little fool.' Despite its negative wording, it conveys an endearing tone. People typically call their loved ones such pet names with tenderness and adoration in casual conversations.