Abstinência means 'withdrawal' or 'abstinence', the kind someone experiences when they stop using an addictive substance.
In this song, IZA uses this powerful word metaphorically. She sings, "Abstinência de mim" ('Withdrawal from me'), to describe how her ex feels after their breakup. She's so intoxicating that being without her love feels like a physical withdrawal, making this a very dramatic and memorable way to express an intense connection.
Brazilian pop and R&B powerhouse IZA knows she has got her partner hooked, and she is totally smug about it. In "Droga", she laughs off their threats to walk away. They get mad, swear they are leaving, but always sprint right back. Why? Because her kiss is an actual habit they cannot kick. She rubs it in right away: "A raiva que te dá / Diz que não voltar / Mas viciou na droga / Que é beijar minha boca" ("The anger that comes over you / You say you won't come back / But you got addicted to the drug / That is kissing my mouth").
What makes this track so playful is the medical metaphor she leans into. She diagnoses her lover with full-blown withdrawal ("abstinência de mim" [withdrawal from me]) and cheekily calls their situation serious: "teu caso é grave" ("your case is serious"). But do not worry, she offers the medicine herself, promising gentle care and total amnesia. The side effects work entirely in her favor: the cure wipes out every single fight and mistake ("os vacilos que eu dei" [the screw-ups I made]), leaving room only for memories of her kisses and the marks she left on their skin. It is smooth, a little toxic, and wonderfully cocky.