bigmouth

[big-mouth] /ˈbɪgˌmaʊθ/
noun, plural bigmouths
[big-mouth z, -mouths] /ˈbɪgˌmaʊðz, -ˌmaʊθs/ (Show IPA), for 1; (especially collectively) bigmouth (especially referring to two or more kinds or species) bigmouths for 2.
1.
a loud, talkative person, especially one who lacks discretion.
2.
any of several fishes having an unusually large mouth.
Origin
1885-90, Americanism; big1 + mouth
British Dictionary definitions for bigmouth

bigmouth

/ˈbɪɡˌmaʊθ/
noun
1.
(slang) a noisy, indiscreet, or boastful person
Derived Forms
big-mouthed, adjective
Slang definitions & phrases for bigmouth

bigmouth

noun
  1. A person who talks constantly and loudly
  2. A person who freely announces personal opinions and judgments; know-it-all, smart-ass
  3. A person who can't keep a secret (1880s+)
Related Terms

have a big mouth