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motor-mouth

[moh-ter-mouth]
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noun, plural mo·tor-mouths [moh-ter-mouths, mouth z] /ˈmoʊ tərˌmaʊθs, ˌmaʊðz/. Slang.
  1. a person who is a constant or irrepressible talker.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for motormouth

motormouth

noun
  1. slang a garrulous person
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012