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
Vikram	-	Indian, Hindi, Marathi, Gujarati, Telugu, Tamil, Kannada
Robby	RAH-bee	English
Zhivko	-	Bulgarian, Macedonian
Xiang	-	Chinese
Humayra	-	Arabic
Cynesige	-	Anglo-Saxon