Encasillaron comes from the verb encasillar, which means to pigeonhole or typecast someone. It implies being unfairly labeled or confined to a certain role or perception.
In the song, the narrator sings, "Me encasillaron por malo" (They pigeonholed me as bad). This word immediately sets a defiant tone, as the narrator challenges the labels others have placed on him, making it an intriguing choice for a push notification.
This song, "El Terror," is a really feisty anthem from Los Alegres Del Barranco! It's all about a guy who's been labeled a "bad guy" ("Me encasillaron por malo") just for defending what's his. He's a big thinker who's been working since he was a kid, and he values his freedom above all else, even saying he "trocé el mecate" [cut the rope] to get it. He's proud of his journey, even without formal education, boasting about his "gran cerebro" [great brain] that he's developed.
He makes it clear he has a good heart for those he cares about, but for his enemies and even the government, he's "el terror" [the terror]. He's not scared of being caught, practically daring the marines and soldiers to come find him: "Que vengan por mí los marinos y guachos" [Let the marines and soldiers come for me]. It's a bold statement that he's got more smarts than strength ("Más vale mañas que fuerza"), comparing himself to eagles that fly high while others stay stuck in the mud. He's definitely not holding back!