The act of extracting heroin-laden blood, for reinjection at a later time. It usually is one's own blood, but could also be the blood of someone who has just overdosed. (Note: NOT RECOMMENDED). It is done as "insurance" in case one's heroin supply runs out. The term is used in Neil Young's 'The Needle and the Damage Done': "milk-blood to keep from runnin' out"
I better milk-blood in case my dope runs out.
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The substance consisting of blood and milk that is released when a nipple piercing is torn off.
"So last night I accidently tore off Rob's nipple piercing and there was blood milk everywhere. That is what he gets for getting those pierced."
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When you milk a meme or trend so hard that it draws blood on it and make it die much faster.
"Gee, people were really milking blood with that among us trend."