Wisconsin (and a bit of Minnesota
I'm from a very unique area right on the border of Minnesota and Wisconsin so our slang and accents are a strong mix of both, so this won't be an entirely accurate depiction of Wisconsinite slang. Side note: it's Wah-scon-sin not Wisss-con-sin. Y'all sound like snakes trying to pronounce our state.
Y'know- Real simple additive to the beginning and end of phrases. Like "dontcha know" except shorter. I hear (and say) it dozens of times a day.
Ex: "Y'know, dee other day I heard on dah radio Rogers ain't doin so well."
Cook up some brats- Don't know how widespread this is, but my dad says is every weekend. Brats are sausage hotdogs basically and are often cook in boiling pots of beer or grilled.
Ex: "Ah, Imma go cook up some brats for lunch gotta Leine' to spare?"
Up North- This means literally anywhere in Minnesota, a cabin somewhere, or any wooden area. Unless its really far south, direction doesn't matter.
Ex: "Next weekend I'm goin' up north fishin' to dah cabin."
A Spotted Cow- The best beer ever, but it's only sold in Wisconsin and illegal to sell anywhere else.
Ex: "Family's comin' down from up north for Christmas, better stock up on Spotted Cow."
Dells- A random town in Central Wisconsin called "Wisconsin Dells" that has an insane amount of waterparks, theme parks and tourist traps. Despite being the waterpark capital of the world and having some of the largest attractions in the world, very few people know about it.
Ex: "Kids gotta three day weekend, y'know, so we goin' down to da Dells."