Maltrata comes from the verb maltratar, meaning "to mistreat" or "to abuse." It's a strong word that conveys a sense of suffering or harm.
In the context of the song, the singer uses it to express the deep pain caused by his ex-lover's absence: "Porque tu ausencia me maltrata" (Because your absence mistreats me). This personification of absence as something that actively harms him makes the word particularly impactful and memorable, highlighting the intensity of his heartbreak.
Pinto Picasso's plan for getting over an ex is simple: go out, turn the music up, and drink about it. He opens by admitting the relationship taught him nothing — "Ya en este punto pa' que sirven los consejos" (At this point, what's the point of advice?) — then lands on the line that gives the song its title: "Lo juro que me olvidaré de ti" (I swear I'll forget you), "con un trago y una bachata" (with a drink and a bachata). A bachata is the guitar-driven Dominican dance style the whole track leans on, so the line is also a statement about the genre itself — heartbreak set to a rhythm you're supposed to dance through.
The verses go back and forth between defiance and admitting it isn't working. He tells the DJ to turn up the bass and orders another round — "Dj sube el bajo" (DJ turn up the bass), "bartender dame un trago" (bartender give me a drink) — but a few lines later he's standing in a packed club feeling more alone than when he walked in: "Y ahora me siento solo al lado de toda esta gente" (And now I feel alone next to all these people). That's the real hook of the song: the trago and the bachata are supposed to be the cure, and half the time they just prove the cure isn't working yet.