An artist who is only proficient in Zbrush and often Keyshot. While their art is amazing on its own, it isn't useful beyond concept work.
These people aren't true 3d artists. They lack the sufficient knowledge to bring an asset through the entirety of the 3D pipleline. But to the layperson what it looks like they are doing is incredible. They are cringe.
"Have you seen Jim's work? It's insanely good!"
"yeah but have you tried working with the guy? he doesn't actually know anything, he's a total zbrush cowboy"