你在我深爱的那座城里
[nĭ zài wŏ shēn ài de nèi zuò chéng lĭ]
The literal meaning 'You are in the city that I love so deeply' signifies that the person being referred to is staying in a place of significance to the nickname user. There's deep affection for that city, probably linked with cherished memories, hopes or a significant chapter in the user’s personal history.