The Jargon File (version 4.4.7, 29 Dec 2003):

shotgun debugging
 n.

    The software equivalent of Easter egging; the making of relatively
    undirected changes to software in the hope that a bug will be perturbed out
    of existence. This almost never works, and usually introduces more bugs.


The Free On-line Dictionary of Computing (30 December 2018):

shotgun debugging

   The software equivalent of Easter egging; the making of
   relatively undirected changes to software in the hope that a
   bug will be perturbed out of existence.  This almost never
   works, and usually introduces more bugs.

   [Jargon File]