I looked back at what the hell I wrote in this thread to make sure I wasn't repeating myself....
"Vulgar" basically means "common". The Vulgate Bible was written in the vulgar or common tongue, the language of the people, Latin, instead of the original Hebrew and Greek.
When the Normans conquered England the old Anglo-Saxon words for bodily functions, etc. which were often four letters long, were replaced by their Norman French equivalents, which were typically much more long-winded and thus sounded more cultured. The Anglo-Saxon words, spoken by the commoners, were "vulgar". The more acceptable versions used by the upper classes were derived from the Latin, which had ceased to be vulgar.
Now centuries later in Canada we have a House of Commons, populated by commoners, where it's improper to call somebody a liar. Rather, he's "misleading the House", which is apparently more acceptable because it's more long-winded.
As many of you know, I'm a bit anal about words (which isn't quite the same as being an asshole).
Edited by ringo, : @#$% spelling.