只要本宫一天没死你永是妃
[zhĭ yào bĕn gōng yī tiān méi sĭ nĭ yŏng shì fēi]
While this palace is still living, you will be always considered imperial concubine (one of ancient Chinese emperor's many wives). The expression has undertones and irony, often used jokingly, referring a relationship where a female holds the dominant side or higher status.