Histriónico translates to "histrionic" in English, which describes behavior that is overly dramatic or theatrical. It's a sophisticated and less common word that immediately grabs attention.
In the song, the artist uses it to critique a society obsessed with fame and attention, where people suffer from a "trastorno histriónico" (histrionic disorder). This word perfectly encapsulates the song's theme of superficiality and the desperate need to "figure out" or stand out in a world where everyone wants to be the protagonist.
"Anónimo" opens with a refusal: "No tengo alias ni seudónimo" ["I have no alias nor pseudonym"], "Soy lo que llaman un anónimo" ["I'm what they call an anonymous person"]. While everyone else chases "el cuarto de hora" ["the quarter hour"] of attention, zooming in on their own lives for the crowd, the narrator stays off the stage entirely — "el rostro sin cosmético de esta realidad patética" ["the face without makeup on this pathetic reality"].
The second half turns the satire outward: people who'd "Robar la clave, hackear el pin" ["steal the password, hack the pin"] just to land a magazine cover, manipulating everyone in their orbit to stay visible. Against that, the narrator chooses solitude on purpose — "Prefiero profesar la autoaceptación que buscar la aprobación de los demás" ["I prefer to profess self-acceptance than seek the approval of others"] — staying "atrás de mi perfil sin nombre" ["behind my nameless profile"], where the loneliness ("Tanta soledad") is the price of not having to perform. The closing lines name what the alternative costs: "A salir que es hora de brillar, a brillar que es hora de mentir" ["Time to go out and shine, time to shine is time to lie"].