Boludez is an Argentinian slang term that translates to "stupidity" or "nonsense." It's a very common and expressive word in Argentina, but less so in other Spanish-speaking countries, making it unique to this song's context.
In the lyrics, Fito Páez sings, "No me voy a cargar toda tu boludez" (I'm not going to carry all your stupidity/nonsense). This line captures a defiant and independent spirit, rejecting the burden of someone else's foolishness or problems. It's a strong, colloquial expression that adds character to the song.
Fito Páez wrote "Nuevo" ("New") right after 9/11, and he puts the event in the song without flinching from it — "Dos torres cayeron" ("Two towers fell"), he sings, "lo siento por ti" ("I'm sorry for you"). Then he does something unexpected: he pulls the camera back to two kids kissing "en un callejón" ("in an alleyway"), as if the only honest answer to a catastrophe that size is to keep living a small, ordinary life anyway.
From there the word "nuevo" turns into a refrain that keeps changing what it means. "Nuevo es ser viejo" ("new is to be old"), he sings, then "Nuevo es morir" ("new is to die") — aging and dying get folded into the same idea as falling in love or writing a song, like nothing is really an ending. The hook, "Vuelvo nuevo a tocar rock and roll" ("I play rock and roll again"), plays as Páez's own statement of purpose: come back different every time, never repeat yourself.
By the last verse the song has come home. He's "De nuevo aquí en el barrio" ("Back here in the neighborhood"), and the closing line — "Vuelvo nuevo y te quiero otra vez" ("I come back again and I love you again") — turns the whole song's idea of renewal into something plainly domestic: love isn't a single moment, it's something you keep choosing again.