Here's a breakdown:
* Calla esa boca: This is a direct and forceful command to be quiet, literally meaning "shut your mouth".
* Locutor: This refers to the announcer, someone who speaks on radio or television.
The phrase is often used in a sarcastic or humorous context, especially when the announcer is being overly dramatic or annoying. It can also be used in a more serious context to demand silence from an overly talkative announcer.