Top Definition
Comes from the medieval belief that aristocratic blood was blue. Usually used talking about nobelty and royal family members.
There's too much blue blood in this family! They really should mix with the common people otherwise they'll degenerate...
מאת French_dude 11 באוגוסט, 2004
Translated from the old Spanish phrase "sangre azul", blue blood derives from the Medieval belief in Europe (among other places) that the blood of the royalty and nobility was blue; since the royal family and aristocrats were wealthy and powerful enough to pay commoners to labor in the fields for them, their skin was translucent and pale enough for their blue veins to stand out.

It also refers to old money families: families that have been aristocrats for many generations.
The blue blood disdainfully looked upon the unrefined manners of the nouveau riche (aka "new money").

The blue blood of the elite could not be tainted by the blood of commoners, lest the whole line be polluted (disregarding the risks of inbreeding).
מאת Lorelili 12 בפברואר, 2011
From the medieval European belief that royalty and nobility had blue blood; the elite had enough power and wealth that they could afford to have peasants and the urban poor do their dirty work for them- since the aristocrats were able to stay inside and avoid long hours in the fields (and the sunlight), they were often so pale that their blue veins showed under their translucent skin, thus leading people to believe that their blood was blue.

Now it generally refers to people from old money: families who have been wealthy aristocrats for generations on generations.
The blue blood elite have long been discouraged from intermarrying with commoners, lest their pure bloodlines be contaminated, ignoring the degenerative effects of inbreeding.
מאת Lorelili 28 בינואר, 2011
This means that you come from a wealthy background (old money).
"His blood is so blue, that he is a natural-born yacht club captain."
מאת Marc 8 בדצמבר, 2003
The first novel in the vampire series by Melissa De La Cruz. Set in the city of Manhattan, the city's supernatural elite are running rampatant. But mysterious cases of full consumptions are turning up; vampires are dying!
The Blue Bloods novels are amazing.
מאת Ashley247 10 באוקטובר, 2008
Old school slang for common folks back in medieval times. Those of low class work in hard labor (agricultural) and spending majority of the time being exposed to the sun; so they tan. Where as the high class folks do nothing, but stay inside their homes; getting paler. So pale that their skin become--as some say like alabaster, that you can see their blue veins through their skin. Thus the word "Blue Blood".
it doesn't matter how hard your dad works, you'll never be a Blue Blood like us.
מאת cinnamonbon 23 ביוני, 2009
A person of noble birth. this group of people are born into an elite and noble family. Blue bloods generally reside on the East Coast (New England) and live privileged lifestyles. Many blue bloods attend prestigious boarding/preparatory schools, elite institutions (colleges and universities); summer in expensive vacation communities (i.e. Martha's Vineyard, Long Island, Maine, New Hampshire, etc.), and wear preppy clothes. Blue bloods are usually extremely affluent and tend to not flaunt there money. They come from "old money" and are the opposite of "nouveau riche".
President John F. Kennedy (JFK) is a blue blood.

Henry lives in Greenwich, Connecticut; summers in East Hampton, goes to Phillips Exeter Academy and plans to attend Yale in the fall. He's a blue blood.
מאת huboli11 6 ביוני, 2012

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