What does eunuch Wen mean?

Image point, with Ji Xiaolan told the eunuch that joke to tell you.

One day, a group of eunuchs pestered Ji Xiaolan and asked him to tell a story. Ji Xiaolan don't want to say it, but the eunuchs pester, there is no way. He said, "Well, I'll tell you one. Once upon a time, there was a eunuch ... "Then he put down his hand and stood up. After waiting for a long time, the eunuchs didn't see anything under him, so they asked, "What about below?" Ji Xiaolan shook off his hand and said, "Right here? There is nothing below! " Then leave with a smile. ...

Generally speaking, it is a metaphor for writing a novel. The meaning of "there is nothing below" is gone before the story is finished ... Hehe ... This is a very vivid statement!