待我长发及腰把你勒死
[dài wŏ zhăng fā jí yāo bă nĭ lè sĭ]
This is more of a humorous or figurative way to express frustration, where literally waiting until one’s hair grows long enough is used as hyperbole to imply using it like a rope. In context, it shows impatience or irritation toward a subject.