This funny Viking postcard is postmarked in 2014.
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Uff da (sometimes also spelled huffda, uff-da, uffda, uff-dah, oofda, ufda, ufdah, oofta, uf daa, or ufta) is an expression of Norwegian origin adopted by Scandinavian-Americans in the 19th century. It is an exclamation that is relatively common in the Upper Midwestern states of the United States. (This postcard was bought in northern Wisconsin and mailed from Duluth Minnesota).
In Norwegian, uff or huff is an interjection used when something is unpleasant, uncomfortable, hurtful, annoying, sad, or irritating.
I grew up also using it as a slang for "DANG!"