My theory is that the cup is regular on the inside and the bottom is weighted to provide stability. It's raktajino. It's Klingon. So if a spontaneous heroic fight erupts around you, you want to
Use the cup as a weapon
Swipe the cup out of the way for the battle without it toppling over so you can then use it to toast on your glorious victory in the battle of the breakfast.
Fun fact: these were actually real cups you could buy (they picked them because of how weird they were), so there are likely unsuspecting people out there using them still today. They don't know that they're prepared for a battle at any moment.
@The_Picard_Maneuver I already tried looking, lol, and while there are some lovely ceramic travel cups out there, I think you'd have to go to a ceramics studio and make your own!
There are a bunch of them on Ebay for fairly reasonable prices, but generally with nautical designs on them instead of the solid blue used in the show.
Yep. I laughed when one of those showed up like it was the cup of the future when I literally used one every day during my morning commute in the 20th century.
I think a good head cannon for this is that a mug is such a basic thing that you don't really need to keep re-inventing a new design from scratch. So when a new replicator system/technology comes out, you just port stuff over from the old one. Like maybe it's one of those patterns in the replicator database that just goes back eons to united earth or something.