Neuilly sa mère is a colloquial and somewhat provocative French expression. While sa mère literally means "his/her mother," in this context, it's a slang intensifier similar to "damn it!" or "my ass!" in English, often used to express strong emotion, frustration, or emphasis.
In the song, it highlights the cultural clash and the protagonist's feelings about being sent to Neuilly, an affluent Parisian suburb, from his working-class neighborhood. It encapsulates the song's central theme of identity and belonging between two very different worlds.
Neuilly Sa Mère paints a lively, tongue-in-cheek portrait of a teenager who swaps his rough-and-ready housing project for France’s wealthiest suburb. Samy finds himself lost among 4x4 SUVs, designer clothes and kids called Sophie or Charles-Henri, while he secretly longs for his old crew, pit bulls and corner kebab. With humor and vivid images, the song highlights the culture clash between la cité and Neuilly and pokes fun at the clichés each side has about the other.
Beneath the jokes runs a hopeful message: wherever you come from, what really matters is where you are heading. By inviting the rich kids to “come see the cité,” Magic System and Faf Larage argue that people share the same dreams and problems, whether they wear fake Vuitton or real Rolex. The track turns social gaps into a playful call for curiosity, respect and unity.