This is the title of the song and literally translates to "barbed wire". It's a striking phrase that you wouldn't expect to find in a love song, making it instantly intriguing.
Bad Bunny uses it as a powerful metaphor, singing "Me amarraste el corazón con alambre de púas" (You tied up my heart with barbed wire). This vivid imagery perfectly captures the feeling of being trapped in a painful yet inescapable love, making it a very memorable and poetic line.
Bad Bunny is completely hooked on an ex in "ALAMBRE PÚA", and he is not trying to hide how desperate he feels. He tells her straight up that nobody compares to her: "Tú te montas en mi carro y pareces un Mercedes-Benz" ("You get into my car and you look like a Mercedes-Benz"). The title itself translates to barbed wire, which sets up the central, dramatic complaint of the track: "Me amarraste el corazón con alambre de púas" ("You tied up my heart with barbed wire"). He feels so trapped under her spell that he asks her flat out, "Habla claro, ma, tú eres bruja" ("Speak clearly, girl, you're a witch").
What makes this track fun for language learners is how he plays with slang and spontaneous Spanglish pairings. When he says "Contigo yo me arrebato sin fumar" ("With you, I get high without smoking"), he uses the Puerto Rican slang arrebato to mean getting completely spaced out on someone's vibe alone. He misses her cocky attitude, calling her "piquetúa" (someone with lots of swagger and style), before rattling off bilingual rhymes like "papi, daddy", "mala, baddie", and "atrevida, naughty". It is funny, chaotic, and fully honest about the regret of realizing too late that a goodbye was final: "No sabía que aquella iba a ser la última vez / Estoy triste, que no la grabé" ("I didn't know that was going to be the last time / I'm sad I didn't record it").