等我长发及腰你敢娶么
[dĕng wŏ zhăng fā jí yāo nĭ găn qŭ me]
Referring to a poetic proposal asking 'When my hair grows down to my waist, will you dare marry me?' A playful, somewhat teasing invitation for a commitment based on the passage of time and physical transformation signifying maturity or readiness for marriage.