Acariciar means "to caress" or "to stroke". It's a tender and intimate verb that evokes a strong sense of touch and affection.
In the song, the lyrics say, "La piel tiene memoria y me pide que la vuelvas a acariciar" (The skin has memory and asks me to caress it again). This line beautifully expresses a deep longing for physical intimacy and the memory of a past touch, making it a very evocative and memorable word in the context of lost love.
A drunk confession set to cumbia. The narrator tells you where he is before he tells you anything else: "Traigo unos tragos ya encima, y los borrachos no mienten" (I already have a few drinks on me, and drunks don't lie), which is his way of promising that everything after this is true. Then he says it: "Te extraño de la A a la Z" (I miss you from A to Z). It is a slightly silly line and it works, because that is what missing someone is like when you cannot rank the parts.
What sells the song is how little has moved since she left. "En mi cuarto tus cosas siguen hasta ahora en el mismo lugar" (In my room your things are still in the same place until now), and then the turn: "Igual que mis sentimientos" (Just like my feelings). The chorus asks outright, with no metaphor at all: "Quiero que vuelvas a mi vida" (I want you to come back into my life), and the nearest he gets to poetry is "En las sábanas solo queda tu olor" (Only your smell remains in the sheets). Ke Personajes bring the Argentine cumbia and Los Ángeles Azules bring the keyboard sound Mexico has been dancing to for decades, so you get heartbreak with a dance floor under it.