谁是我的小傻瓜我是你的小傻瓜
[shéi shì wŏ de xiăo shă guā wŏ shì nĭ de xiăo shă guā]
Translated directly as who is my little fool; I am your little fool, symbolizing innocence and naivety in romantic relationship, often used by lovers to each other affectionately.