沉鱼落雁雁你妈倾世倾城倾你爸
[chén yú luò yàn yàn nĭ mā qīng shì qīng chéng qīng nĭ bà]
Literally 'sink the fish, fall the geese and ravish your dad'. A deliberately hyperbolic expression used humorously to describe extraordinary beauty which is beyond all logic and boundaries, possibly to tease somebody about their arrogance in appearance