One of those international exclamations that have made it to areas where there is some Scandinavian populations. It can express joy, frustration, bewilderment, etc.
The term Uff Da! can be found on many items at a Scandinavian shop - such as coffee mugs, license plate frames, etc.
It is an analogue of such words in other languages as "oy vey" or "carumba."
In Norway, Charlie Brown says, "Uff Da!" instead of "Good grief!"
Lars: The government is going to audit my income tax!
Henrik: Uff Da!
Thor: Did you see that hottie over there?
Leffe: Uff Da!
Henrik: Can you believe that Norway is only 100 years old this year?
Roar: Uff Da!