Chamullo is a colloquial and very expressive word, especially common in Argentina, where Emanero is from. It means to sweet-talk, deceive, or spin a yarn, often with the intention of getting something from someone or avoiding trouble.
In the song, the lyric "Dijo que me amaba, pero me chamullo" (She said she loved me, but she sweet-talked me) perfectly captures the feeling of being misled or played in a relationship. It's a more vivid and less common word than simply saying "me mintió" (she lied to me), making it interesting and memorable.
Have you ever felt like you gave your all in a relationship, but it just wasn't enough? That's exactly what Emanero and FMK are singing about in "Tu 50" (Your 50). The song is all about a guy who wanted to be his partner's "cincuenta" [fifty], meaning his other half, but he admits, "me quedé cortito y no llegue ni al diez" [I fell short and didn't even reach ten]. He messed up, got distracted, and now he's regretting it big time.
He's taking full responsibility, saying he "no estuve a la altura" [wasn't up to par] and didn't know how to protect her from his own craziness. Now he's paying the price, literally drinking away his sorrows, "voy por la cuarta botella de ron" [I'm on my fourth bottle of rum] trying to forget that he's "el culpable de mi perdición" [the cause of my perdition]. FMK jumps in to add his own take, realizing that love can be a disaster and sometimes people just aren't who you thought they were, even calling his ex "mala y cara" [bad and expensive]. It's a relatable anthem for anyone who's been through a tough breakup and is left wishing they could turn back time.