ratchet-mouth

ratchet mouth

A person who talks incessantly or irrepressibly. Jake is such a ratchet mouth that I find it exhausting talking to him! You need to quit being such a ratchet mouth in the classroom!
See also: mouth, ratchet
Farlex Dictionary of Idioms.

ratchet-mouth

and motor-mouth
n. someone who talks incessantly. (Also a term of address.) Tell that ratchet-mouth to shut up! Hey, motor-mouth! Don’t you ever stop?
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions
See also:
  • ratchet mouth
  • motor
  • motor-mouth
  • a motor mouth
  • ratchet
  • loud mouth
  • big mouth
  • bigmouth
  • a big mouth
  • a hobby horse