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.

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.
See also:
  • flap (one's) gums
  • flap your gums
  • flap (one's) chops
  • flap (one's) jaws
  • bump (one's) gums
  • beat (one's) gums
  • beat gums
  • beat one’s gums
  • gum
  • shrink from