伱若离去巴掌扇去
[nĭ ruò lí qù bā zhăng shàn qù]
It's a colloquial expression which can be taken literally to mean 'if you leave, you'll receive a slap'. It's a forceful declaration of preventing abandonment. But due to cultural differences, this phrase should be understood as conveying a desperate desire not to be left alone rather than promoting actual physical aggression.