[Xaccers]

P's and Q's is definitely pints and quarts as it's a phrase older than the printing press.

The words "bloody" is offencive because it's a contraction of "by our lady" and there for blasphimus

sh*t and f**k are saxon for rubbish and sex.
We were invaded by the Normans (Norse men of France) and it became fashionable to speak Norman French (saxon was considered course and for the peasants) so if you wanted to shock you'd say something in saxon.
Over the years the shockability of those words increased, until recently when they've become more mild.
c*nt is another saxon word, the word quaint comes from it.

When the Normans invaded, they put someone (can't remember his name) in charge of Scotland as Steward.
This evolved into Stewart, where the Stewart clan comes from.
Mary queen of scotts lived in France, and couldn't pronounce Stewart properly, so she changed the spelling to Stuart.