土豆呼叫地瓜地瓜回答土豆
[tŭ dòu hū jiào dì guā dì guā huí dá tŭ dòu]
Translated as 'Potato Calls Sweet Potato, Sweet Potato Responds Potato'. An endearing, quirky phrase possibly referring to a close friendship between two individuals who call each other by these nicknames.