"I'm gonna fix that last joke by taking out all the words and adding new ones"

Mitch Hedberg's quote recommends that he is not satisfied with the joke he has just informed and is looking to enhance it. He is recommending that he will secure all the words from the joke and replace them with new ones. This implies that he is not content with the words he has actually utilized and thinks that by changing them, he can make the joke funnier. This quote also recommends that he is positive in his capability to make the joke much better which he is willing to put in the effort to do so. It is a testimony to his commitment to his craft and his commitment to making his jokes as funny as possible. It is also a suggestion that even the best comedians are continuously making every effort to enhance their material which they are never ever pleased with their work.