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1.
A woman who has gotten pregnant or had a kid and so is making mothers milk and lets men suck it out of her tits for money.
You been to that milk whore?
by Deep Blue 2012 September 10, 2009
 
2.
What one of your siblings become if they drink all the milk, and you have to go out and buy more.

or

any person who is incapable of going a day without drinking a gallon of milk. Also, they never change the bag and make other people buy refillls for them. BASTARDS!
My little brother is a milk whore.
by Perkins44 July 29, 2006