待你长发及腰送把剪刀可好
[dài nĭ zhăng fā jí yāo sòng bă jiăn dāo kĕ hăo]
It's a whimsical suggestion that humorously plays upon romantic sentiments in traditional Chinese culture, suggesting waiting until you have long enough hair and I'll send you scissors, questioning or mocking the promise of romance or marriage.