blabbermouth

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Related to blabbermouths: blab

blabbermouth

1. n. someone who talks too much and tells secrets. You are such a blabbermouth!
2. tv. to tell secrets in public. Don’t blabbermouth this to everybody.
References in periodicals archive ?
They have to go into the FBI WitnessProtection Programme but unfortunately, not even the FBI can save them from their own blabbermouths.
Then the little blabbermouths might repeat later what they heard.
Sorry if we're not f***ing blabbermouths - Jesus Christ