The Etymology dictionary refers to "red blooded" as "vigorous,
spirited" and notes that it is recorded from 1877 (SOURCE: Etymology,
<http://www.etymonline.com/index.php?term=red>).

And indeed, the term "red blooded American" (or in other versions
found online) means an American passionate about his American-ness, a
vigorous person, first and foremost

Actually Suba, the entry specifically refuted the association with "blue-bloods" or aristocracy. So that's two nerd points to me today!

It is in contrast to blue-blooded, as in an England ruled by aristocrats. In reality, America is rapidly becoming a plutocracy, ruled by the ultra-rich. Maybe someday they will refer to it as green-blooded.

In a long-ago Star Trek campaign, I was able to make two tasteless menstruation jokes:

• On Vulcan, ads for menstrual products use red fluid in the demos so as not to make viewers uncomfortable.
• If the Hell's Angels exist in the 24th century, can they get "blue wings" or "green wings"?

duh!!!!!!

english are blue blooded
italians don't have blood they have marinara
french have red blood but it all comes from a duck press
japanese have soy sauce
chinese have a different soy sauce
Koreans have red chili paste
and we do not ever speak of the germans or javanese

I assumed as much, but today's Tea Partiers use it for rather different reasons (i.e., THEM ILLIGAL IMGRINTS!).

As you know, Canadians bleed maple. It tends to make things sticky and is one of the main reasons why we go to war so infrequently.