待我长发及腰你已娶她
[dài wŏ zhăng fā jí yāo nĭ yĭ qŭ tā]
Waiting until my hair reaches my waist implies maturing into a graceful and desirable state only for the loved one to have married someone else in the meantime. Thus, it expresses heartache, longing, waiting in vain and missed opportunities in relationships.