Humpty Dumpty expresses a dismissive attitude towards the conventional meaning of words, claiming that he can define them as he pleases. He believes that words are simply tools he can manipulate to mean whatever he wants, regardless of their accepted meanings.
He emphasizes his point by saying that when he uses a word, it means exactly what he decides it to mean, illustrating his view that language is flexible and subject to personal interpretation. This perspective highlights the playful and paradoxical nature of language explored in Lewis Carroll's works.