长发及腰蹲坑别忘了撩
[zhăng fā jí yāo dūn kēng bié wàng le liáo]
It humorously talks about practical considerations while maintaining appearance - suggesting long-haired people don't forget to pull their hair up when they need to sit on squat toilets to keep their hair clean. This shows a lighthearted concern for practicality alongside vanity.