土豆土豆呼叫地瓜地瓜地瓜呼叫土豆
[tŭ dòu tŭ dòu hū jiào dì guā dì guā dì guā hū jiào tŭ dòu]
'Potato potato calling sweet potato, sweet potato sweet potato calling potato'. A playful nickname likely derived from childhood games or rhymes, where potatoes (马铃薯) and sweet potatoes (红薯) are common food items in China used humorously to symbolize simple, friendly relationships or fond memories.