It's properly spelled "Yooper" - and pronounced that way, too. For those of you that are full of density this morning, we live in the Upper Peninsula of Michigan -- the "U. P.", pronounced just like it should be. From there to "Yooper" is pretty easy.
The UP is abut 1/3 of Michigan's land area - and about 3% of the state's population lives (t)here. It's sparsely populated, in other words, and we're pretty much satisfied with things that way. A commonly-offered saying (by a Yooper, that is) is along the lines of "Come up here for a visit, spend your money, then go home and stay there".
Okay, back to White Castle. I tell you the story about the place some other time, but suffice it to say that I've enjoyed the 'burgers since I was a little kid. Nancy and I usually get some on our way to or from Maxton. Glad that Columbus (probably the nearest 'Castle location to Wilmington) isn't too far off the route.