flap your 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 your gums

AMERICAN, INFORMAL
If someone flaps their gums, they talk a lot without saying anything important. Who wants to hear you flapping your gums first thing in the morning?
See also: flap, gum
Collins COBUILD Idioms Dictionary, 3rd ed.
See also:
  • flap (one's) gums
  • flap 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
References in periodicals archive
RE: 'Flap Your Gums But Give 'Em Nothing': A practical guide to Media Management of Ministerial Negotiation with Indigenous Communities
Memorandum: maximum security--read and eat