What does they mean by pull a Charlie Gordon?

This is my opinion, Enjoy.

Well, I think that people think that Charlie has some problem with his mind and he is not smart, and they're describing him by a word named after him, and it almost like dump. They just want to tease Charlie because of his IQ. He's not normal and he's not that smart. Basically, people say that to describe this person is dump like Charlie. They say that to describe how dump Charlie is and they want to make fun of him.