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1.
a group of people who expresses intense feelings of hatred or spite, when the reason for this is perceived as unreasonable or spurious.
PERSON #1: You know people be hating on you right.
PERSON #2: I don't pay attention to the hater mill.

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PERSON #1: I see you got a hater mill going about me.
PERSON #2: I wouldn't do that.
PERSON #1: Why would people have my name in their mouth when it's you I share confidentiality with?
by Mr. Terrence L. Trezvant July 09, 2011