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1.
Bad blood is when you have beef with someone.
person: "you know Tank?"
2: "Yea, I know that nigga. Me and that nigga got bad blood between us."
by Landy February 05, 2004
 
2.
Was a euphenism in the deep south for syphilis
"My brotha' has bad blood. He don't get no betta'.
by chalk757 July 28, 2004