blind pig

plural blind pigs

1. USslangA blind tiger or speakeasy.First known use 19th c.

   Then the harpooner carried away a pink flask to be filled in some blind pig, for there were no licensed saloons in that locality. We drank the cheap rotgut out of tumblers.

   1913 August, Jack London, chapter VI, in John Barleycorn, New York, N.Y.: The Century Co., →OCLC, page 48

   2 more examples

   This was […] the woman whose every look and movement stirred him in a way he couldn't describe (but had tried to, time and again, to his classmates, to the rare Barnard girl he asked to the theater or a concert, and to the tarts and working girls he discovered in the blind pigs and outside the vaudeville houses).

   1993, TC Boyle, The Road to Wellville, Penguin, published 1994, page 29

   According to a Rutgers University Web site dedicated to the riots, “The Detroit Riot of 1967 began when police vice squad officers executed a raid on an after hours drinking club or 'blind pig' in a predominantly black neighborhoods located at Twelfth Street and Clairmount Avenue […]

   2012, Jeremy Williams, Detroit: The Black Bottom Community

2. Southern USA police officer who has been bribed to ignore illegal activities.
3. InternetA Web address on the Deep Web that piggybacks on a public domain but is not visible to the system.

   The Web address isn't officially registered, it's a blind pig.

   2017, Dean Koontz, The Silent Corner, page 197