貌美如花似你妈英俊潇洒似你爸
[mào mĕi rú huā sì nĭ mā yīng jùn xiāo să sì nĭ bà]
It translates roughly to 'as beautiful as your mother and as handsome as your father.' It's often used humorously to compliment both parents, sometimes in a slightly over-the-top manner.