你长发齐腰我咔嚓一刀
[nĭ zhăng fā qí yāo wŏ kă cā yī dāo]
'Ni ChangFa QiYao Wo KaCha YiDao', this translates as when you grow your hair long enough to reach your waist, I just cut it with one chop. A dramatic way to depict a sharp contrast or decision, possibly indicating sudden heartlessness in cutting ties.