"25" and "255" in Nanjing dialect are not the same meaning, and their origins are far deeper than the latter. In ancient times, people began to celebrate the New Year on the 24th of the twelfth lunar month, while the royal family and dignitaries began to celebrate the New Year on the 23rd one day in advance to show their expensive status. Accordingly, the lowly people, including beggars, actresses and prostitutes, can only celebrate the New Year on the 25th, so 25th has become such an insulting swearing word. But now most people don't know the origin, and their spoken English is almost 250.