你说只有我们懂
[nĭ shuō zhĭ yŏu wŏ men dŏng]
'You Say Only We Understand' implies a feeling of having unique mutual understanding. When choosing this as a nickname, perhaps this user thinks he or she has a deep connection with some particular persons, sharing the same viewpoint or special experience with only a select few. The rest might not fully grasp what they comprehend and feel deeply about something or someone specific in life.