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The Kushroom Mingdom was a magical clone version of the Mushroom Kingdom created by SMG3 and Grand Dad. The former had the latter create this kingdom so that he could rule over it, saving him the trouble of trying to conquer the Mushroom Kingdom.
It is like the Mushroom Kingdom, but everything and everyone in it is a knockoff version of the usual denizens of the Mushroom Kingdom. For example, instead of Toads, the Kushroom Mingdom has gnomes. It can be found by going through the wall that is supposed to lead to Shifting Sand Land.
It was eventually destroyed by Bowsur. However, SMG3 chose to blame the Mario Brothers for its destruction. It was most likely abandoned by SMG3, Elmo, Old Man Hobo, and Shrek, along with any survivors.