What is "vogon"

The Vogons are a fictional alien race from the planet Vogsphere in The Hitchhiker's Guide to the Galaxy—initially a BBC Radio series by Douglas Adams—who are responsible for the destruction of the Earth, in order to facilitate an intergalactic highway construction project. Vogons are slug-like but vaguely humanoid, are bulkier than humans, and have green skin. Vogons are described as “one of the most unpleasant races in the galaxy—not actually evil, but bad-tempered, bureaucratic, officious and callous", and having "as much sex appeal as a road accident" as well as being the authors of "the third worst poetry in the universe". They are employed as the galactic government's bureaucrats.