A very common, colloquial French slang expression used to tell someone to shut up is "Ferme ta gueule" (literally translating to "shut your trap/mouth"), though it is quite vulgar and confrontational. A more common, casual, and slightly milder slang alternative is "Tais-toi" (standard) or simply shouting "Chut!" or using the popular slang verb "Vos gants" or "La ferme."
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