flap gums

flap (one's) gums

To chatter or blather. Quit flapping your gums—I need some quiet so I can think! Whenever Charlie starts to flap his gums, I can't get in a word!

See also: flap, gum

Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

flap one's gums

 and flap one's jaws

Rur. to talk aimlessly. They're still out on the porch, flapping their gums. Well, I can't sit here flapping my jaws all day. Gotta get back to work.

See also: flap, gum

McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.