长发及腰上厕所得撂
[zhăng fā jí yāo shàng cè suŏ dé liào]
This nickname playfully describes a situation where one's long hair extends down to the waist. The second part '上厕所得撂' suggests a funny or exaggerated inconvenience one might encounter due to having very long hair, even when using the restroom. It adds a humorous and quirky touch.