Casse la démarche literally translates to "breaks the walk". In modern French slang, it's a huge compliment describing someone's unique and confident swagger—the cool way they carry themselves.
In the song, Vegedream uses this phrase to hype up the French defender Samuel Umtiti, whose celebratory walk became famous during the 2018 World Cup. It's a perfect example of popular slang used to capture the celebratory, confident energy of the team.
Listen to this track and you can instantly feel the pure madness of a whole country throwing a massive street party. Vegedream wrote "Ramenez La Coupe À La Maison" ("Bring the cup back home") to celebrate France winning the 2018 football World Cup, exactly twenty years after their first win in 1998 ("Vingt ans après, on est champions" ["Twenty years later, we are champions"]). Instead of writing vague poetry about victory, he literally turns the entire squad into a hype checklist. Each superstar gets their own shoutout matched to their trademark style on the pitch. You hear him hype up Kylian Mbappé with rapid-fire football tricks: "Passement de jambe, crochet à gauche, à droite... virgule, petit-pont, frappe" ("Step-over, cut inside left, right... elastic flick, nutmeg, strike"). He also laughs at Ousmane Dembélé being so ambidextrous he cannot choose a favourite foot ("J'sais plus si j'suis gaucher ou droitier, je tire des deux pieds" ["I don't know anymore if I'm left-footed or right-footed, I shoot with both feet"]).
Vegedream packs the verses with real French street slang that you will not find in regular textbooks. When he chants "Casse la démarche comme Samuel, Samuel Umtiti" ("Break your walk like Samuel Umtiti"), he is telling everyone to copy the defender's famously cocky, hip-swaying celebration walk. Right after, he drops "Et s'il y a drah on peut toujours appeler Benjamin Mendy" ("And if there's trouble, we can always call Benjamin Mendy"), using the slang term "drah" to mean beef, chaos, or a big fight. He chants N'Golo Kanté's name like a playground rhythm game, hails Paul Pogba by his real-life nickname "La Pioche" ("The Pickaxe"), and wraps everything up by thanking manager Didier Deschamps. It is repetitive, ridiculously catchy, and built entirely around the collective chant "On est ensemble" ("We are together").