flapjaw
1. Someone prone to talking a lot or at length. Good luck getting out of here—Aunt Louise is a real flapjaw and could easily blather to you for an hour. A: "I'm sorry you had to listen to my mom ramble on like that." B: "Ah, I'm used to it—my mom's a total flapjaw too." Oh boy, my daughter's been a flapjaw ever since she learned to talk. Just constant chatter all the time!
2. Someone who too readily shares information, especially that which is private or confidential. Some flapjaw has been talking to the press about our new product. Needless to say, if I find out who it is, they will be fired on the spot. If you've got a secret, don't tell it to a flapjaw like Marty! Now I'm in trouble, thanks to you being a flapjaw and blurting out that I got home past curfew last night!
Farlex Dictionary of Idioms. © 2024 Farlex, Inc, all rights reserved.