Fierro is a fascinating word because of its multiple meanings in Mexican slang. While its literal translation is "iron", it is most commonly used in this context to mean "gun".
This song cleverly uses both the noun and exclamation forms. The lyric "Moon Rocks junto al fierro" (Moon Rocks next to the gun) points to a dangerous lifestyle. However, when the artist shouts "¡Fierro!", it's an energetic exclamation meaning "Let's go!" or "Right on!", making it a key piece of slang for understanding this genre of music.
MR INTERNACIONAL celebrates the jet-setting, larger-than-life lifestyle that Tito Double P now enjoys after rising to fame. Over a driving Regional Mexican beat, the singer looks back on simpler days when he actually drove his own car; today he relaxes at 180 km/h without even touching the wheel. Surrounded by designer clothes, Moon Rocks, luxury cruises, and friends who party from Spain to Los Cabos, he paints a vivid picture of a world filled with champagne showers, jetskis, and lobster lunches on the coast.
Beneath the glitter, Tito throws a playful jab at critics and freeloaders who tell him how to spend his cash. “Mr. Internacional” pushes back with confidence: he does what he wants, wherever he lands, and hears only “yes, sir” from those around him. The song is an anthem of self-made success, global adventure, and unapologetic enjoyment of the finer things in life.