tài​píng​gōng​zhǔ

Princess Taiping

太平公主 tài​píng​gōng​zhǔ
Princess Taiping
Princess Taiping (c. 665-713), daughter of Emperor Gaozong and Empress Wu Zetian of the Tang Dynasty; she was a powerful political figure known for her intelligence and influence at court.
flat-chested woman
A humorous or derogatory slang term for a woman with a flat chest, playing on the word 太平 tài​píng meaning peaceful or flat and level