待我长发及腰少年我勒死你
[dài wŏ zhăng fā jí yāo shăo nián wŏ lè sĭ nĭ]
A playful or dramatic expression meaning 'When my hair grows long enough to reach my waist, I’ll strangle the young lad.' Often humorously expressing frustration directed towards someone, usually used between close friends or lovers without real menace intended.