What does it mean that you are really a clever boy?

is a kind of ridicule, which means that the other person is not smart.

It seems to praise people's cleverness, but the deeper meaning that is more commonly used is to describe people who are not very clever or even a little stupid at some time, and its similar words are idiot, fool and so on.

The stem of "great cleverness" comes from The Richest Man in Xihong City.

in life, we should be a really smart person, and don't be teased by others, as if we were a big smart person.