Loose liver

a person who lives a somewhat dissolute life.

See also: Liver

Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
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Though a loose liver among his guests, the governor was a strict disciplinarian among his men; keeping them in perfect subjection, and having seven on guard night and day.
Despite being a churchman, Philip was a notoriously loose liver. According to his secretary and chaplain, Gerard Geldenhouwer, he was not only 'rather passionate in the love of young girls', but dismissed any idea of clerical chastity with laughter 'saying it was impossible for men of sound body ...