flap (one's) gums

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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!

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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.

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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