瘦成一道闪电劈死你
[shòu chéng yī dào shăn diàn pī sĭ nĭ]
'Thin as Lightning That Can Shock You'. It is used humorously to convey the desire or boast to become so thin it shocks or overwhelms others. It's an exaggerated way to talk about the aspiration for rapid or extreme weight loss.