你说你傻没人比你更傻你说你笨没人比你更笨
[nĭ shuō nĭ shă méi rén bĭ nĭ gèng shă nĭ shuō nĭ bèn méi rén bĭ nĭ gèng bèn]
It humorously emphasizes the user's self-deprecation or the extent of another person's perceived naivety or incompetence through repetition for effect.