French slang/argot expression to demand silence in a violent or immediate way: 1. shut up; shut your trap/gob/hole, etcetera. 2. While sufficient when used alone, is frequently combined with a descriptive noun that is usually insulting, vulgar or rude (often all three).
Continental French: Ta gueule connard !
(shut your trap, cunt/wanker/bastard!)
Quebecois French: Fermes ta gueule, ostie trou de cul!
(shut your trap, fucking asshole!)