How do you say oh boy in Swedish?

There isn't a single perfect equivalent of "Oh boy!" in Swedish that captures the same informal, slightly excited or apprehensive tone. The best translation depends on the context. Here are a few options:

* Oj då! (Oy daw!) - This is a good general option expressing surprise, often slightly negative or worried. It's closer to "Oh dear!" or "Oh my!" than "Oh boy!" but works in many situations.

* Oj, oj, oj! (Oy, oy, oy!) - A more emphatic version of "Oj då!", expressing stronger surprise or excitement.

* Jaha! (Yah-ha!) - This expresses a realization or acknowledgment, sometimes with a slightly surprised or amused tone. It's less enthusiastic than "Oh boy!"

* Herregud! (Hair-reh-good!) - Literally "Lord God!", this is a stronger exclamation of surprise, often used in a negative or exasperated way. It's not a direct equivalent but can work depending on the nuance of "Oh boy!"

To choose the best translation, consider the emotion you want to convey. If you're excited, "Oj, oj, oj!" might be best. If you're slightly worried, "Oj då!" is more appropriate. If it's a more neutral expression of surprise, "Jaha!" could work.