An IT person that is responsible for the server infrastructure in a data center or technology environment. This is usually a well defined silo where the individual only focuses on servers. The "Peter Principal" is strong here as most server guys have already been promoted beyond their level of competence. They also typically have no knowledge about the network that transports their data, nor the apps that run on their server, and do not care to learn.
That dufus Server Guy Chris wouldn't know an Ethernet cable from his unusually small Wang.