Contagiarme literally means "to infect myself" or "to catch" something, like a disease. However, it's often used metaphorically in Spanish to mean "to be influenced by" or "to catch a feeling/idea" from someone.
In this song, the artist sings, "Y contagiarme de tu forma de pensar" (And to catch your way of thinking). It's an interesting and evocative way to express a deep desire to be influenced by someone's perspective, highlighting a strong emotional connection and admiration.
Have you ever felt so consumed by someone that everything just falls apart when they're not around? That's exactly the vibe LA RECETA gives us in "Si No Estás" [If You're Not Here].
He sings about feeling lost, saying "No, no, no, que no sé a dónde voy" [No, no, no, I don't know where I'm going] and how everything feels like a "desastre" [disaster] without this person. It's like he's having hallucinations, seeing "mil planetas de repente" [a thousand planets suddenly], all because he's so obsessed. He's tired of the distance and waiting, just wanting "dos billetes para amarte" [two tickets to love you] and nothing else. It's a pretty intense look at how someone can completely take over your thoughts, to the point where he even says, "Me olvido de quién soy" [I forget who I am].