待我长发及腰陪你终老可好
[dài wŏ zhăng fā jí yāo péi nĭ zhōng lăo kĕ hăo]
It means 'When my hair grows long enough to touch my waist, will you stay with me until I grow old?'. In Chinese culture, this kind of expression represents a romantic promise of lasting forever, reflecting a desire for true love.