This is what I thought you were talking about when I selected the second option. I have a good friend who’s from Maryland, and talks about Natty Boh, Utz potato chips, and Old Bay all the time.
Except, as seen above, you’re conflating two different beers: Natural Light/Ice and National Bohemian (which I had never heard of until this thread.) Natty for me has always been the former beer. It’s also currently the cheap-o beer at Walgreens here now that they don’t seem to sell Big Flats anymore (which was actually all right for a $3 a six-pack type of beer.)