noun, plural blab·ber·mouths [blab-er-mouthz, -mouths] /ˈblæb ərˌmaʊðz, -ˌmaʊθs/.
Examples from the Web for blabbermouth
Why, then, does she bother to lecture a blabbermouth like Jaimee Grubbs or any of Tiger's other mercenary mistresses?
Silence that blabbermouth; he does not know what he is talking about.The Origins of Contemporary France, Volume 2 (of 6)|Hippolyte A. Taine
"I thought you'd managed to get that blabbermouth transposed to PolTerm," Zostha said.Time Crime|H. Beam Piper
Pelton muttered: "Why Frank sponsors that blabbermouth of a Mongery—"Null-ABC|Henry Beam Piper and John Joseph McGuire