It literally translates to "Tell your friend to shut the f* up**". It is extremely rude and inappropriate, and could lead to conflict.
If you want to tell your friend to stop talking, it's important to do so respectfully. Here are some more appropriate options:
* "¿Puedes callarte un poco?" (Can you be quiet for a bit?)
* "Basta ya, por favor." (Stop it, please.)
* "Estoy tratando de concentrarme." (I'm trying to concentrate.)
Remember, respectful communication is key to building healthy relationships.