From Minecraft Wiki
Displays a message about yourself.
- Java Edition
me <action ...>
- Pocket Edition
me <action: string>
- Fails if any target selectors do not resolve to at least one online player, or if any named players are not online.
- On success, sends a narrative message to the other players in the form of "* Your Name action" (e.g., "* Alice sneezes." or "* Alice exploded." ). If a multi-person target selector (e.g., @a) is used in action, the list of names is formatted as "name1 and name2" for two players, or "name1, name2, ... and nameN" for N players.