SOURCE: Stutchkoff, Der Oytser fun der Yidisher Shprakh. A "long tongue" in Yiddish, like a "big mouth" in English, indicates that a person talks a lot.
אַן אייזל דערקענט מען אין די לאַנגע אויערן, אַ נאַר אין דער לאַנגער צונג.
An eyzl derkent men in di lange oyern, a nar in der langer tsung.
An ass is recognized by his long ears, a fool by his long tongue.