blabbermouth

Why, then, does she bother to lecture a blabbermouth like Jaimee Grubbs or any of Tiger's other mercenary mistresses?

But the truth was that it was simply a traveling blabbermouth, whom the White House duly unearthed and punished.

Pelton muttered: "Why Frank sponsors that blabbermouth of a Mongery—"

"I thought you'd managed to get that blabbermouth transposed to PolTerm," Zostha said.

Silence that blabbermouth; he does not know what he is talking about.