The soup dumplings in Shanghainese, namely Tangyuan, are a specialty snack for the traditional Chinese festival of Lantern Festival. But because of its shape resembles a zero on a test paper, it also has the meaning of zero in Shanghainese, the same meaning as eating zero duck eggs, since it has this meaning, of course, it is the last thing that Shanghai girls want to see.

In addition to this common usage, "eating soup dumplings" can also be used in old Shanghai to describe the situation of a dancer who has no partner for the whole night; in addition, there is also "hollow soup dumplings", which means that the original plan has fallen through. "There is the original plan fell through, white busy work a, or to other people's commitment can not be realized and so on.