I have had to explain it as such while teaching kids to use Zoom over the pandemic, and yeah one of the first things I got was "it's a drop up menu!"

The term “popover” has been gaining popularity in the last decade or so, as a superset of dropdowns. HTML adopting the term a couple of years ago has helped with this.

The only thing that seems wrong about it to me is that it's above the point where the user clicked rather than underneath; and that's only because that point is near the bottom of the screen.