Being Mixed blooded is having more than one defined nationality and switching from side to side of said nationality.
Me: Oi! Bob you silly sheep shagger what are you doing?
Bob: Hey I'm not Welsh I am English!
Me: Yo, you silly Brimstone tooth prick whats up?
Bob: I'm not English man I am American!
Me: Jesus Christ what now!
Bob: Guess what I'm going home today!
Me: Where to?
Me: You Silly Mixed Blood.