你说过你是冷血动物
[nĭ shuō guò nĭ shì lĕng xuè dòng wù]
The nickname '你说过你是冷血动物' means 'You said you are a cold-blooded animal'. In context, it usually represents someone who is emotionless, indifferent, or difficult to connect with emotionally. It may refer to past experiences in dealing with someone who has shown emotional detachment.