Plantao' is a colloquial and somewhat slang term derived from plantar, meaning "to plant". In this context, it means to be "stood up" or "left hanging" by someone, often in a romantic or social situation.
DrefQuila uses it when he says, "Y que deje plantao' a ese payaso Krusty" (And that she leaves that clown Krusty stood up). It's an engaging and slightly edgy word that adds a playful, rebellious tone to the lyrics, suggesting a desire for the girl to ditch her current partner for him.
"Lo Deberías Pensar" (You Should Think About It) is DrefQuila and Jonas Sanche making a smooth, cheeky pitch to a woman stuck in a stale relationship. The narrator is sure she is thinking about him in her room: "Pero en tu cuarto / Sé que estás pensándome" (But in your room / I know you're thinking of me). With her current man she is "viviendo siempre lo mismo" (living the same thing every time), so he offers to come by in case she feels "algo distinto" (something different). The hook is blunt about the plan: "Traje marihuana, escapemos juntos / Lo deberías pensar" (I brought weed, let's run away together / You should think about it).
The second verse is full of pop-culture jokes worth decoding. "Estu" is short for estudio, the recording studio, and "Drefkun" is DrefQuila's own nickname. "Ella es mi Kylie / Pero no quiere una Stormy" (She's my Kylie / But she doesn't want a Stormi) plays on Kylie Jenner and her daughter Stormi, a cheeky way of saying she wants him but not a baby. He tells her to leave "plantao' a ese payaso Krusty" (that Krusty the clown standing there), with plantar meaning to stand someone up and Krusty being the Simpsons clown. Lines like "pronostic" (forecast) and "Plot Twist" show how casually Chilean urban music mixes English into Spanish. It is flirty, a bit much, and very sure of itself.