What is "uff da"

interj. (context US Upper Midwestern US English) (non-gloss definition: Expressing surprise, dismay, relief, exhaustion, or a sudden shock to the senses.)

Uff da (sometimes also spelled huffda, uff-da, uffda, uff-dah, oofda, ufda, ufdah, oofta, or uf daa) is an exclamation of Norwegian origin adopted by Scandinavian-Americans in the 19th century. It is an exclamation that is relatively common in the Upper Midwestern region of the United States. In Swedish usch då, same meaning and usage as in Norwegian.