Cumbión is a fantastic, energetic word you'll hear in Mexican music. It comes from cumbia, a popular Latin American music and dance genre, but adds the augmentative suffix -ón to mean "big" or "intense".
In "Un Cumbión Dolido," Christian Nodal isn't just dancing to any song; he's dancing a big cumbia to cope with his pain (dolido). This single word perfectly captures the song's theme of finding a powerful, lively escape from heartbreak on the dance floor.
This song is the ultimate anthem for dancing through the pain. Christian Nodal sets the scene perfectly: he's in a dive bar, drinking with strangers, and "Cantando las de despecho a todo pulmón" (singing songs of heartbreak at the top of his lungs). He's not alone, either. He points out the guy next to him who also lost everything because he loved blindly. It's a whole mood of communal misery, but instead of just sitting in it, they're turning it into a party.
Nodal keeps coming back to his grandma's advice: "el amor puede matar" (love can kill). He says it almost got him, but not this time. So what's the solution when you're heartbroken but still standing? You find someone else who's broken to dance with. He's not looking for a new love, just "una diablita pa' bailar / Que también esté rota para encajar" (a little devil to dance with / who's also broken, so we can fit together). The song's big idea is right there in the title, which means "A Hurt Cumbia." He's "dolido, pero bailando un cumbión" (in pain, but dancing a cumbión), turning sorrow into a reason to move.