Malilla is a colloquial Mexican slang term that's far more expressive than simply saying "sick". It comes from malo (bad) with the diminutive -illa, adding a nuance of feeling vaguely unwell, down, or hungover.
In this song, the singer contrasts his ex's calm demeanor with his own state: "Qué tranquila se te ve / Y yo bien malilla". It brilliantly captures the emotional and physical crash of a heartbreak hangover, making it a fascinating and culturally rich word for learners.
Malibu is a petty, wounded post-breakup track where Peso Pluma and Tito Double P nurse a bruised ego with expensive drinks. The narrator starts off hungover and hurt, whining, "Bien sarra que se siente sin ti empezar el día" ("It feels so lousy starting the day without you"). He is downing whiskey because of love again, annoyed that his ex looks totally calm while he feels "bien malilla" (in rough shape, like a physical hangover from craving someone). He calls her "bonita y canija" ("pretty and wicked"), cursing her betrayal after finding out she was unfaithful.
Then the mood flips completely into bitter bragging. Instead of sitting at home, he hops in a brand-new car and flies in on a private jet to sip margaritas in coastal California. He rubs his luxury life right in her face: "Con otra morra que no eres tú" ("With another girl who isn't you"), boasting that his new date looks better and has a bigger backside. The track ends on pure spite with "Dos margaritas por Malibú / Aquí anduvieras, pero andas de..." ("Two margaritas in Malibu / You'd be here, but you're out fooling around"). It is blunt, petty, and packed with northern Mexican slang like chale (a sigh of defeat or bad luck) and morra (girl), turning raw heartbreak into a flex.