等你长发及腰借你头发上吊
[dĕng nĭ zhăng fā jí yāo jiè nĭ tóu fā shàng diào]
It humorously or tragically states the idea of waiting for someone’s hair to grow until it can reach the waist, only to use it to hang oneself, reflecting a complicated relationship full of longing, despair, or satire.