待你长发及腰我定咔嚓一刀到你长裙落地我定绊你一脚
[dài nĭ zhăng fā jí yāo wŏ dìng kă cā yī dāo dào nĭ zhăng qún luò dì wŏ dìng bàn nĭ yī jiăo]
It humorously means 'When you grow your hair down to your waist, I'll chop it off in one cut; When your dress touches the ground, I'll trip you.' It shows mischievousness or playingfully antagonistic relationship, possibly within a familiar setting like among friends or family.