给我一巴掌扇醒我的梦
[jĭ wŏ yī bā zhăng shàn xĭng wŏ de mèng]
It signifies a strong need or hope to break out of the illusion or fantasy one is in. Like needing someone or something to slap them awake into reality, thus getting rid of the daydream or unrealistic expectations they might have had.