Chapulín literally means "grasshopper" in Spanish. However, in Mexican slang, it's often used to describe a "turncoat" or someone who switches sides, especially in a disloyal way.
In this song, Dharius uses it to call out someone who he believes has betrayed their crew or changed allegiances for personal gain. It's an interesting word because it takes a common insect and gives it a powerful, negative connotation in a street context.
Dharius is not holding back in "ALV TODOS"! This track is a full-on lyrical assault, a diss track aimed squarely at his rivals. He's basically saying, "You've been talking a big game, but now it's time to show your true colors." He calls out their cowardice, saying things like "Sacarla y no jalarle solo lo hacen los cobardes" [Only cowards pull it out and don't pull the trigger].
He's got no patience for fakes, reminding someone, "Rapeo por sus canciones', dijiste en el camerino" [I rap because of your songs,' you said in the dressing room], highlighting their hypocrisy. Dharius makes it clear that he's the king of the rap battle, stating, "Porque en una tiradera, al Tirano nadie le gana" [Because in a diss track, no one beats the Tyrant]. He's confident, a little menacing, and ready to take on anyone who challenges him, warning them to "Es mejor que se callen o les puede ir muy mal" [It's better if you shut up or things could go very wrong for you].