Ole was a farmer in Mintsota. (That’s Minnesota; he was a Scandahoovian.)

He needed a new milk cow, and heard about one for sale over in Nordakota. (That would be North Dakota.)

He drove to Nordakota, found the farm and looked at the cow.>
He reached under to see if she gave milk. When he grabbed the tit and pulled, the cow farted. Ole was surprised.

He looked at the farmer selling the cow, then reached under the cow to try again. He grabbed another tit, pulled, and the cow farted again.
Milk did come out however, so after some discussion, Ole bought the cow and took her home.

He got back to Mintsota, and called over his neighbor Jimmy Mooney, and said, "Jimmy, come look at dis ere new cow I yust bought. Pull her tit, and see vat happens."

So Jimmy reached under, pulled the tit - and the cow farted.>
Jimmy looked at Ole and said, "You bought dis here cow in Nordakota, din't yah?"

Ole was surprised, since he hadn't told Jimmy about his trip.

Ole replied, "Yah, dat’s right. But how'd yah know?"
Jimmy said, "My wife's from Nordakota."