You would say "O dun" when:
* You are trying a food or drink and you enjoy the taste.
* Someone offers you food or drink and you accept it with appreciation.
* You are complimenting someone on their cooking skills.
Example:
* Person A: "Would you like some of this soup?"
* Person B: "Yes, please! O dun!"
Note:
* "O dun" is a very common and versatile expression in Yoruba.
* You can use it in many situations where you want to express your appreciation for something that is pleasing to your taste buds.