待我长发及腰甩你一脸马
[dài wŏ zhăng fā jí yāo shuăi nĭ yī liăn mă]
This sentence translates loosely as 'wait till my hair grows to my waist then give you a face full'. Here it implies a playful or vengeful comeback: the individual is planning some retaliation or dramatic reveal, probably in reaction to how a person has treated them poorly.