What does ‘Dead/I’m dead/dying’ mean?

Example: “I’m dying! You have to watch this video.”

Definition: laughing/amused

Explanation: People use the phrase “I’m dying” as a way to express how funny they think something is. It’s a shorter way to say that they’re dying from laughter. People generally type out “dead” or “I’m dead” when they share something they thought was funny on social media.