待你长发及腰我卡擦一剪刀
[dài nĭ zhăng fā jí yāo wŏ kă cā yī jiăn dāo]
It translates to 'When Your Hair Reaches Waist Length, I'll Snip It Off With Scissors'. It humorously and dramatically conveys impatience, possibly about someone taking too long, often playfully said among friends.