motor-mouth

[moh-ter-mouth]

noun, plural mo·tor-mouths [moh-ter-mouths, mouth z] /ˈmoʊ tərˌmaʊθs, ˌmaʊðz/. Slang.

a person who is a constant or irrepressible talker.

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019