长发未及腰短发已及耳
[zhăng fā wèi jí yāo duăn fā yĭ jí ĕr]
'Chang Fa Wei Ji Yao Duan Fa Yi Ji Er' means 'Long Hair Has Not Reached The Waist But Short Hair Has Already Reached The Ears'. It depicts a transition or state of change. People who choose such usernames usually want to express personal growth or evolution - perhaps from immaturity (short hair) towards becoming wiser (longer hair).