An adage used pejoratively to denote someone who exhibits incessant qualities.
Dude1 "Oi bruv your a dickhead!"

Dude2 "Man, SHUT YOUR BEAK!"
by Swagcrow no#1 September 21, 2008
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to shut up; be quiet, close your mouth as your being told.
dude: hey man, you owe me money!
guy: shut your beak! i'll get it to you later.
by markekek May 11, 2008
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