1. An assertive phrase produced when the mouth of a nearby human being is at perpetual motion spewing undecipherable mumbo jumbo.

2. Phrase used when the horny bill protrudes to the point where said bill could be used for a competitive game of group jump roping.
Jason: Well in my humble opinion, of course without offending anyone who thinks differently from my point of view, but also by looking at this matter in a different way and without fighting and by trying to make it clear, and by considering each and every ones opinion, I honestly believe that I completely forgot what I was going to say.
Schuyler: Bro, you need to shut that beak...
by shutthatsnout October 2, 2018
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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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