The Collaborative International Dictionary of English v.0.48:

Liver \Liv"er\, n.
   1. One who, or that which, lives.
      [1913 Webster]

            And try if life be worth the liver's care. --Prior.
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   2. A resident; a dweller; as, a liver in Brooklyn.
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   3. One whose course of life has some marked characteristic
      (expressed by an adjective); as, a free liver.
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   Fast liver, one who lives in an extravagant and dissipated
      way.

   Free liver, Good liver, one given to the pleasures of the
      table.

   Loose liver, a person who lives a somewhat dissolute life.
      [1913 Webster]