The term that means "to say something that is opposite from what is true or from what you really mean" is verbal irony. Verbal irony is a figure of speech in which someone says something but means the opposite, often to create humor or to emphasize a point. To find this answer, you can use various methods. One way is to use a search engine and enter the definition or description you have for the term. Another method is to consult a dictionary or a glossary of literary terms, where you can look for the specific term you are interested in. Online resources or textbooks on literature or language can also provide the answer.