没心没肺驴肝肺
[méi xīn méi fèi lǘ gān fèi]
This nickname conveys a somewhat humorous or carefree attitude, literally meaning 'heartless and unfeeling, but with the heart of a donkey'. In Chinese slang, it refers to someone who does not get emotionally involved too much. So they act in a lighthearted or irresponsible way.