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...
A caller named Emily from Fishers, Indiana, wondered about nebby, a word she uses to mean picky and that her Michigan friends use to mean gossipy. In Western Pennsylvania, where the word is especially common, nebby means nosy or snooping, and it...