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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