SOURCE: Stutchkoff, Der Oytser fun der Yidisher Shprakh (photo source)A "long tongue" in Yiddish, like a "big mouth" in English, indicates that a person talks a lot.
אַ בהמה האָט אַ לאַנגע צונג און מוז שווײַגן.
A beheyme hot a lange tsung un muz shvaygn.
A cow has a long tongue but has to keep quiet.