Being Mixed blooded is having more than one defined nationality and switching from side to side of said nationality.
Day 1
Me: Oi! Bob you silly sheep shagger what are you doing?
Bob: Hey I'm not Welsh I am English!

Day 3
Me: Yo, you silly Brimstone tooth prick whats up?
Bob: I'm not English man I am American!

Day 7
Me: Jesus Christ what now!
Bob: Guess what I'm going home today!
Me: Where to?
Bob: Wales.
Me: You Silly Mixed Blood.
by Shamrock Shank May 25, 2012
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A used in contemporary american youth to describe the mental state when a girl going in and out of consciousness and unable to say no to sexual advances. It is looked down upon to have sex with a girl who is "mixing blood" and is considered a form of date rape.

Comes from when a women is raped and drunk and both menstrual and bodily bloods are mixed during the violent sex.
girl- "Please stop, I'm mixing blood, I don't know what I'm doing!"
boy- "Ok just one sec, i'm almost done"
by John MacPherson November 1, 2010
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