Rembobine means "rewind". It's a nostalgic and evocative word that immediately brings to mind older technologies like cassette tapes and VCRs.
In the song, Youssoupha repeatedly sings "Je rembobine la cassette" (I rewind the cassette), using the act of rewinding a physical tape as a metaphor for revisiting his past memories and childhood. This word is central to the song's theme of nostalgia and looking back at simpler times, making it both unique and memorable.
Youssoupha's "La Cassette" is a super cool trip down memory lane, all about his childhood and early days. He starts by looking at old photos from "Bien avant que j'arrive en France" [Well before I arrived in France], reminding us that he's from an older era, even saying, "J'suis pas Congolais, j'suis Zaïrois" [I'm not Congolese, I'm Zairean]. It's like he's digging through a box of old memories, with images like a young him with a big head on a record sleeve: "J'suis tout p'tit avec une grosse tête" [I'm tiny with a big head].
He brings us right into his world before Paris, listening to "Michael Jackson dans le walkman" [Michael Jackson in the Walkman] and watching "films porno en VHS" [porn films on VHS]. He calls the whole song "La putain d'mixtape de ma vie" [The damn mixtape of my life], and you can almost hear him rewinding it, asking, "Prête-moi ton walkman que je rembobine la cassette" [Lend me your Walkman so I can rewind the cassette]. Even with all this looking back, he's not scared of getting older, saying, "J'ai d'la nostalgie dans les yeux Mais j'ai pas peur de devenir vieux" [I have nostalgia in my eyes But I'm not afraid of getting old]. It's a really honest and personal look at where he came from.