待你长发及腰我就咔擦一刀
[dài nĭ zhăng fā jí yāo wŏ jiù kă cā yī dāo]
Translated as 'Once your hair grows to waist length, I'll snip', which sounds like part of a dramatic or poetic scenario where the narrator is making a decisive gesture in a significant moment of change or decision in the relationship.