foiler
n.— «Note that Blair won’t be an only child for long if Cyrus does marry Eleanor. His son Aaron (the artist now dating Serena) would become Blair’s step-brother, just like in the books. Oh, and just a warning to anyone searching for “Gossip Girls” spoilers—Josh wants you all to know that he sometimes puts out fake information to throw everyone off the scent! They are called “Foilers.”» —“Dish Of Salt, Spoiler Alert: A ’Gossip Girl’ Wedding” NBC Los Angeles Nov. 14, 2008. (source: Double-Tongued Dictionary)
Further reading
Ray, a teacher at a bilingual elementary school near Dallas, Texas, shares the Spanish term his family uses for gossiping after a party: saca garra. Spanish garra means “claw” or “talon,” and sacar la garra is used on either...
You might describe someone particularly talkative or gossipy by saying that their tongue wags at both ends. A more elaborate version is Your tongue wags at both ends and is tied in the middle. Another variant: Your tongue is hinged in the middle...