心太狗
[xīn tài gŏu]
The nickname '心太狗' (Xin Tai Gou) can be understood as 'Heart Too Dog', which is a humorous way to express that someone's heart or intentions are unreliable or disloyal. It carries a colloquial and sarcastic tone, indicating that someone behaves like a dog (disloyal or untrustworthy) in terms of their feelings or actions, implying disapproval or disappointment.