你身材有料吗都是牛奶朱古力
[nĭ shēn cái yŏu liào ma dōu shì niú năi zhū gŭ lì]
This nickname seems to be a funny phrase suggesting that one's good physique or attractiveness is all thanks to drinking milk and chocolate, implying that the source of their appeal comes from indulging in tasty treats.