Vicio literally translates to "vice" or "addiction". While it often refers to a bad habit, Selena uses this powerful word to describe a love so intense and irresistible that it feels like a drug.
In the song, she sings "Tus labios son mi vicio" (Your lips are my vice), creating a passionate and slightly dangerous image. This metaphor expresses a deep craving and dependency on her lover's kisses, making it a very memorable and dramatic way to talk about love.
Selena Gomez is completely head-over-heels in this song, and she's not afraid to admit it! The whole track centers on an intense, almost addictive attraction to someone. She repeats over and over that their lips are her "vicio mío" (my vice). It's a powerful obsession where she feels she would "todo lo arriesgo" (risk it all) just for one of their kisses. The feeling is so strong that she needs this person with her constantly, saying "Si no te tengo yo me pongo mal" (If I don't have you, I feel bad).
But this isn't just about physical attraction. This person has had a huge emotional impact on her. Before them, she "No creía en el amor" (didn't believe in love). This new relationship has completely changed her outlook, healing her past pain. She sings that this person "sanaste el corazón / Le diste vida a lo que estaba muerto" (healed my heart / You gave life to what was dead). It's a song about finding a love so powerful it feels like a necessary, wonderful addiction that brought her back to life.