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Meaning of poison-pen

poi•son-pen

Pronunciation: (poi'zun-pen'), [key]
— adj.
  1. composed or sent maliciously, as a letter, usually anonymously and for the purpose of damaging another's reputation or happiness: The newspaper received a poison-pen letter alleging that the mayor was misusing city funds.
  2. characterized by or given to the sending of poison-pen letters: a poison-pen campaign; a poison-pen writer.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.