flap (one's) jaws

To talk in a meaningless, aimless, or idle manner. Jim always starts flapping his jaws after he's had a couple of drinks.

Name	Pronounced	Usage
Scott	[skɔt]
Bobby	BAH-bee	English
Dekel	-	Hebrew
Nsia	-	Western African, Akan
Vilhelmo	veel-HEL-mo	Esperanto
Constantin	kon-stahn-TEEN (Romanian), kawn-stawn-TEN (French)	Romanian, French