To be extremely loyal, dependable, or solid. It refers to someone you can count on in any situation (in Argentina, fierro is a regional word for iron, suggesting the person is as tough and reliable as metal).
You are a tough, inseparable pair or two of a kind. (The axe and machete are the primary tools of the Dominican countryside, symbolizing a duo that is rugged and functions as one).
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!
A snitch or tattletale who reports others' mistakes or rule-breaking without being asked. Unlike a spy who acts for money or a cause, a buche acts out of personal interest and only when convenient. They are less compulsive than a buchón, choosing their moments to tell on others for their own benefit.
They padlocked the balcony door; some buche told them we were going out that way to smoke.