Shut your beak Share definition Flag An adage used pejoratively to denote someone who exhibits incessant qualities. Dude1 "Oi bruv your a dickhead!" Dude2 "Man, SHUT YOUR BEAK!" Shut your beak by Swagcrow no#1 November 2, 2008 0 0 Get merch Get the Shut your beak mug. Buy Now — $32.95 See more merch