Porco giuda is a very common Italian exclamation you'll hear in movies and on the street, but probably not in a textbook. It literally means "Judas the pig" and is used to express frustration, shock, or annoyance, similar to "Damn it!" or "For crying out loud!"
In the song, the singer uses this phrase when he sees a married couple his age and has a bitter realization that he could have been in their shoes. It's a perfect example of the raw, emotional slang that makes learning a language so fun and authentic.
Ever find yourself sitting somewhere, looking around, and suddenly feeling like you're stuck in a time loop? That's exactly where this song starts. The singer is in the "Stessa storia, stesso posto, stesso bar" (Same story, same place, same bar), watching the same old scene. He feels a bit lost, and this feeling sends him on a trip down memory lane to his youth.
The chorus is a blast of pure nostalgia for the good old days. He remembers the "immense compagnie" (huge groups of friends), riding two-up on a scooter, and the feeling that your friends had your back no matter what, telling you "Tranquillo, siam qui noi" (Don't worry, we're here for you). But back in the present, he sees an old acquaintance with a wedding ring and thinks, "porco giuda potrei essere io" (damn, that could have been me). The song ends with a simple, tough truth: "Il tempo passa per tutti lo sai / Nessuno indietro lo riporterà" (Time passes for everyone, you know / No one can bring it back). It's a bittersweet look at the past and how it shapes who we are today.