Hallucine comes from the verb halluciner, meaning "to hallucinate" or "to be delusional". It's a vivid and somewhat dramatic word that immediately grabs attention.
In the song, the narrator repeatedly exclaims, "Maman, j'hallucine, je vois les morts" (Mom, I'm hallucinating, I see the dead). This word is central to the song's theme of a fantastical, dreamlike state where the line between reality and imagination blurs, making it both memorable and key to understanding the lyrics.
"Mercredi" is Pierre de Maere's fever dream about a mind that starts slipping. Every Wednesday the singer sees ghosts and fairies, watches the dead dance at night, and feels a monster take shape in his own living room. His father panics and calls him foolish, his mother worries he's hallucinating, but he keeps sinking further into the vision anyway.
Rather than fighting it, he leans in: he calls himself a bad boy who curses other people's idols and incantations, because he believes in the stories that enchant him more than in anyone else's "holy evidence." The chorus repeats like a loop he can't escape, dancing with the dead until he forgets it all again by morning.
It's less a literal ghost story than a song about losing your grip on reality on purpose, choosing imagination and madness over the rigid rationality everyone around him insists on.