Local Mumbo Sauce Seller May Have to Call Its Condiment Something Else – CityPaper
There is disagreement over whether the sweet sauce served at D.C. carryout out restaurants is mumbo or mambo sauce. A trademark dispute may help solve the issue:

But according to a decision by the U.S. Patent and Trademark Office’s Trademark Trial and Appeal Board, the term “mumbo sauce”—and perhaps the sweet, barbecue-like sauce itself—is not a D.C. native, but was legally born in Chicago. The upshot: The Chicago-born Argia B’s Mumbo Sauce can keep its trademark, while the locally based Capital City Mumbo Sauce may have to find a new moniker.

Can’t help but notice but that’s a big road win for Chicago, since the Trademark Office is just outside of D.C. in Alexandria.

Not familiar with mumbo/mambo sauce? Here’s some background from a 2011 Post story: Mumbo sauce: The 2 words on everybody’s lips – The Post