Here's a breakdown of the meaning:
* Se: This is the Haitian Creole word for "to be".
* Timoun: This is the Haitian Creole word for "child".
Therefore, "se timoun" means "to be a child".
It is often used in a playful or endearing manner, suggesting someone is acting childishly or innocently.
Example:
* "Ou se timoun!" (You are being childish!)