待你长发及腰送你剪刀
[dài nĭ zhăng fā jí yāo sòng nĭ jiăn dāo]
This translates roughly to “Wait until your hair grows to waist-length; then I will give you scissors”. The line expresses an ironic and possibly sarcastic sentiment: waiting for a moment of beauty only to offer its end. It's also sometimes used in contexts of giving up on someone or something over time.