待我头发长了少年娶我可好
[dài wŏ tóu fā zhăng le shăo nián qŭ wŏ kĕ hăo]
Translates into 'Wait until my hair grows boy, then will you marry me?'. This expresses a wish to be waited for and married after some self-chosen changes, probably personal growth, symbolized by long hair.