Source : Webster's Revised Unabridged Dictionary (1913)

Billingsgate \Bil"lings*gate`\, n.
   1. A market near the Billings gate in London, celebrated for
      fish and foul language.

   2. Coarsely abusive, foul, or profane language; vituperation;
      ribaldry.

Source : WordNet®

billingsgate
     n : foul-mouthed or obscene abuse [syn: {scurrility}]