* Sarcasm: This is the most common and involves saying something in a way that contradicts what you actually mean, often with the intention of being humorous or mocking.
* Irony: Similar to sarcasm, but often with a more subtle or unintentional element. It can be situational (where the outcome is the opposite of what is expected) or verbal (where words are used to convey the opposite of their literal meaning).
* Double entendre: This refers to a word or phrase that has two meanings, one of which is often suggestive or humorous.
* Understatement: This involves downplaying the importance of something, often for comedic effect.
* Euphemism: This involves using a polite or indirect term to refer to something that is considered offensive or unpleasant.
* Hyperbole: This involves exaggeration for emphasis or effect. While not technically saying one thing and meaning another, it can be used to express the opposite of what is literally said.
The specific term used will depend on the context and the speaker's intention.