It's a printer that, when you tell it to print, tries its best to find a reason to refuse to do so.

Most newer models that automatically make themselves available to all the devices connected to the network they are connected to, and manage the printer queue internally. Usually comes with a ton of shitty "features" e.g preventing you from printing black & white when you're out of yellow ink.
2-in-one scanner+printer machines are especially heinous with this, most of the ones I've used block you from scanning a document if you're out of any ink (yes, even when you're only trying to scan and not use the "copy" mode)

Somehow they found a way to make me miss having to boot the "printer PC" and wrangling windows' god awful printer queue system.