Rescate means 'rescue' or 'salvation'. It's a powerful and evocative word that suggests being saved from a difficult situation.
In the song, the artist sings, "El tequila y un gallito me sirvieron de rescate" (Tequila and a joint served as my rescue). He uses this word to describe how he found solace and a way to cope after a breakup, highlighting the emotional intensity of his recovery.
This song is the ultimate anthem for when you're finally over a bad relationship and feeling better for it. Arcángel and Grupo Frontera kick things off with a very modern breakup image: "Tú y yo estábamos conectados y la señal se nos cayó" (You and I were connected and the signal dropped). The connection is gone, and he's completely done, even saying he's moved on so much that "cambié hasta de reloj" (I even changed my watch).
The chorus is a powerful declaration of independence: "Y ahora sin ti me va mejor, ya no tengo estrés" (And now without you, I'm doing better, I have no more stress). The cleverest line is "Las cuatro letras del amor las cambié por tres" (I changed the four letters of love for three). He's swapping the four letters of "amor" (love) for the three letters in the title, "ALV." This is a very informal Mexican slang expression that basically means sending something or someone to hell. But the song gives it a positive spin later on, suggesting "ALV" can also mean "algo lindo vendrá" (something beautiful will come). It's a song about taking back your life, even if you once admitted, "Quería un futuro contigo, sólo contigo" (I wanted a future with you, only with you).