长发及腰一定静电不少
[zhăng fā jí yāo yī dìng jìng diàn bù shăo]
Loosely translated, 'if your hair reaches down to your waist, there must be quite a bit of static electricity'. It's a humorous or playful observation on how long hair might get statically charged, also suggesting the impracticalities sometimes related to having long hair.