Vaivén translates to "sway" or a rhythmic "back-and-forth movement". It's a fantastic, dynamic word that perfectly describes motion and rhythm.
In the song, Kapo sings "Que me tiene loco / Con ese vaivén" (She has me going crazy / With that sway). He's captivated by the mesmerizing way his partner sways her hips when she dances. It's a word that not only sounds cool but also perfectly captures the dancehall energy of the track.
Ever sat parked in your car, listening to the radio, and felt like every single track is calling you out? That is the exact spot this track starts from: "Parqueado en el mismo lugar donde te conocí" [Parked in the same spot where I met you]. Distance is doing its worst here—"Vos allá y yo acá" [You over there and me over here]—and isolation quickly sets in. Instead of going out to clear their head, the speaker locks themselves inside ("Me encierro en cuatro paredes" [I shut myself between four walls]), obsessing over small details like an ex's dance moves and their lips. Notice the pronoun vos; it is a regional form of 'you' used in places like parts of Colombia and Argentina, giving the lyrics an informal, intimate tone.
Then things flash back to how the romance kicked off: winning them over with a single rose and dancing together to dancehall rhythms ("Bailando dancehall, me la llevé" [Dancing dancehall, I took her with me]). The attraction was clearly off the charts, but now miles separate them. The singer asks their lover to look up at the night sky and treat the moon like a shared telephone line: "Mira la luna y siente que estoy al oído susurrando" [Look at the moon and feel that I am whispering in your ear]. It feels romantic, a little dramatic, and completely lost in longing, crowned by that endlessly repeated line: "Una historia tan hermosa / En estos tiempos no se ve" [A story this beautiful / You don't see nowadays].