Buchón
A snitch or rat who compulsively exposes others, whether the information is true or not. Unlike a gossip who just talks behind people's backs, a buchón takes the info directly to the people who will be most pissed off or hurt by it. It is usually used as a harsh insult.
Remember my cousin Ramon? I had not seen him in five years, ran into him at a bar while I was with a client, and when I got home I had a huge mess because he had already called my wife and my mother to say I was kissing a woman and that we were holding hands. The damn guy turned out to be a total buchón!
Automatically translated from Spanish