Vicio translates to "vice" or "bad habit." It's a word that immediately sparks curiosity because it suggests something illicit or a strong, perhaps unhealthy, inclination.
In "Un Mal Vicio," the lyrics playfully refer to the protagonist's attraction to someone as a "vicio," implying that falling for this person, especially under the influence of alcohol, is a captivating and perhaps irresistible bad habit. This metaphorical use makes the word intriguing and central to the song's narrative.
"Un Mal Vicio" ("A Bad Vice") is about a night out that turns into something more, and not being sure if it was real feelings or just the drinking.
The narrator goes to a party ready for anything, pulls his friends along, and spots someone he likes. A few drinks in, he starts wondering out loud whether she'll like him back. The night goes on and she's still there, and he chalks it up to the alcohol bringing them together.
The chorus is the whole song's question: is having a vice really a bad thing, when it's the reason he worked up the nerve to approach her? Or was it just the drink that brought him here? By the second verse it's happened again, unplanned, and he hopes she remembers him the next morning, because to him she's one in a million.