待你长发到腰我就咔嚓一刀
[dài nĭ zhăng fā dào yāo wŏ jiù kă cā yī dāo]
The meaning conveyed here is quite humorous and slightly mischievous; literally it translates to 'When your hair reaches your waist, I’ll snip it off', expressing a casual playfulness in interactions between close friends or lovers.