Alboroto translates to "uproar," "commotion," or "ruckus." It's a wonderfully energetic and slightly chaotic word that you don't usually hear in a romantic ballad.
In the song, Camilo sings that when they get married, "se va a armar un alboroto" (it's going to cause an uproar). He uses this playful term to express that their wedding won't be a quiet affair, but a massive, joyous, and loud celebration that will get everyone talking. It's a unique way to describe the incredible excitement of marrying the love of his life.
This song is a beautiful, heartfelt declaration from someone on their wedding day. Camilo sings from the perspective of a groom who is completely in awe of the person he's about to marry. He remembers the exact moment he fell in love, feeling like the ground disappeared from under his feet. He compares himself to the moon, whose only purpose is to circle the earth, saying his only ambition is to revolve around his partner: "dar vueltas y vueltas / Alrededor de ti" (to go round and round / around you).
Now, standing at the altar, he can hardly believe this day is real. He's watching his bride walk towards him, thinking about their future together in a house filled with children. He feels so lucky that he jokes maybe God made a mistake and gave him someone so perfect by accident. The song ends with a powerful promise of forever, as he swears eternal love, saying "ni la muerte podrá separar / Lo que Dios decide juntar" (not even death can separate / what God decides to join).