Troca is a slang term for "truck," commonly used in Mexican Spanish and popular in Regional Mexican music. It's an anglicism, adapted directly from the English word.
In the song, Ivan Cornejo paints a classic heartbroken scene: "Música triste en la troca" (Sad music in the truck). Using this specific word instead of the more standard camioneta adds a layer of cultural authenticity and sets a vivid, relatable mood for anyone who's ever dealt with a breakup by blasting sad songs on a late-night drive.
This song is a straight-up, no-filter look at a fresh breakup. Ivan Cornejo starts with a question that anyone who's been dumped can understand: "¿Cómo voy a estar contento / Si tú ya no estás conmigo?" (How can I be happy / If you're not with me anymore?). He's missing the little things, like getting texts on his iPhone every morning, and feeling like he wasted his time and money on "mil ramos de rosas" (a thousand bouquets of roses). He knows it's over for good, but that doesn't make it hurt any less.
His plan for getting over her is pretty intense. He's going to go out with friends, drink "mil botellas" (a thousand bottles), and stop rejecting other girls who show interest. But at the same time, he admits he's going to listen to "Música triste en la troca" (Sad music in the truck) at night just so he can remember her and cry. The song ends on such a numb, heavy note. He says, "No te amo ni te odio / Aunque me dejaste muerto" (I don't love you or hate you / Even though you left me dead). He sees the relationship as a "lección de mi vida" (a lesson in my life), but it's clear the lesson left him feeling completely empty.