Fluviale translates to "fluvial" or "riverine," referring to things related to rivers. It's an uncommon and intriguing word to find in a pop song.
In the lyrics, the singer states, "Je n'suis pas d'la brigade fluviale, non" (I'm not part of the river police brigade). This line adds a touch of unexpected imagery and humor, as he distances himself from any official role in searching for his lost love, emphasizing his personal, almost helpless, state of longing.
"Vendredi 12" is Benjamin Biolay looking back at a breakup and wondering if the other person still thinks about it the way he does. He opens with small, physical memories: her skin, her voice, her new haircut. It's the kind of detail you only notice about someone you've watched closely.
The title line, "it was only a Friday the 12th," runs through the song like a shrug. Nothing about that day looked special from the outside. A neighbor was mowing his lawn, no black cat crossed his path, no obvious sign that anything was about to end. But she left quietly anyway, and he's been turning that ordinary Friday over ever since.
He plays it cool ("nothing is fundamental, everything is fake"), but the questions keep circling back: where were you that night, do you remember any of this. By the end he admits he hasn't changed anything, just in case she comes back like nothing happened. It's a song about pretending indifference while clearly still counting the days.