Armchair genius

A person, particularly in science academia, who *never* actually does any work, but loves to obnoxiously pontificate during meetings on a wide variety of topics, usually exposing the fact that they have no practical knowledge on any topic whatsoever. When it comes time to publish, they insist that they be included on the author list because they contributed "expertise" and "guidance". They butt into private work conversations, and immediately use the royal "we" to describe what "we" are doing on the project. Such individuals are invariably total ass kissers to those in charge, which explains how they are often able to progress in academia despite knowing fuck all, and contributing nothing.