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 humbleopinion, 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...
An attempt to shut up a loud bitch who will only yell at you becuase she thinks she won't get hit/has some big boyfriend to protect her.
One of the first lines in Way Of The Gun, delivered by Ryan Phillippe to some loud-mouth cunt yelling at him from behind her boyfiend. He then punches her in the goddamn dome.
Raving Bitch: Hey dickless, get off the fucking car! Hey fucker, get your slippery fucking ass of the car! Listen to me, get off the fucking car with your fucking ass!
Parker: Shut that cunt's mouth or I'll come over there and fuckstart her head!