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!
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
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 Copyright © 2006 by The McGraw-Hill Companies, Inc. All rights reserved.