Fourmis literally translates to "ants". While it might seem like an ordinary word, its use in this song is quite idiomatic and interesting.
In the lyrics, Bigflo & Oli sing, "J'aurai plus de fourmis dans les jambes" (I will no longer have ants in my legs). This French idiom, "avoir des fourmis dans les jambes," means to have pins and needles or to be restless and eager to move. It's a vivid and memorable way to express a feeling of impatience or a desire for action, making it a unique word choice for a learner.
This song is a beautiful list of hopes for the future. The main dream, repeated in the chorus, is almost impossibly big: "Un jour, j'irai sur la lune" (One day, I'll go to the moon). But the singer is honest about how hard this feels, admitting, "Et si j'disais que j'en étais sûr / J'te mentirais" (And if I said I was sure / I'd be lying to you). The moon isn't just a rock in the sky; it's a goal that seems to look back at him, making the impossible feel possible.
Throughout the song, he imagines different versions of his future self. One day he'll be a father, teaching his son that "chaque erreur est un essai" (every mistake is an attempt). One day he'll be strong, wise, and finally himself, having solved his problems and stopped running. It's a song about the long, uncertain journey of growing up and becoming the person you hope to be.