ETYMOLOGY
from German Grobian, from medieval Latin Grobianus, name of an imaginary personage, often referred to by writers of the 15th – 6th century in Germany as the type of boorishness,
from German grob (coarse, rude)
EXAMPLE
“…In breefe, he became from an Idiot and a Clowne, to be one of the most compleat Gentlman in Cyprus and did many valorous exploits, and all for the loue of Mistris Iphiginia. In a word, I may say thus much of them all, let them be neuer so clownish, rude and horrid, Gobrians and sluts, if once they be in loue, they will be most neat & spruce and beginne to trick vp, and to haue a good opinion of themselues. …”
From: The Anatomy of Melancholy VVhat It Is
By Robert Burton, 1621
Lexicophilia 