How do you say good boy in yiddish?

There isn't a direct translation of "good boy" in Yiddish that carries the same affectionate tone. Here are some options, depending on the context and level of formality:

Informal:

* "A gut yingel" (a good boy) - This is the most literal translation, but it's quite formal.

* "A gut kinder" (a good child) - This is more common than "yingel" and is less formal, though it can be used for both boys and girls.

* "A gut shayneh" (a good one) - This is a more playful and endearing way to say "good boy."

* "A gut maidel" (a good girl) - This can also be used for a boy, especially if you want to emphasize the boy's good behavior and kindness.

Formal:

* "A tzaddik" (a righteous one) - This is a very formal and respectful way to say "good boy," implying that the boy is a good person with high moral standards.

Remember, the best way to say "good boy" in Yiddish depends on the situation and the relationship between the speaker and the listener.