待我长发及腰我弄死你
[dài wŏ zhăng fā jí yāo wŏ nòng sĭ nĭ]
Literally it seems playful or even jokingly threatening at first look ('When I grow my hair long enough to reach my waist, I'll deal with you'). However, such phrases are sometimes used online in Chinese communities expressing a humorous or exaggerated promise, threat, or intention which does not actually mean something real action will be done