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

PBD
 /P?B?D/, n.

    [abbrev. of ?Programmer Brain Damage?] Applied to bug reports revealing
    places where the program was obviously broken by an incompetent or
    short-sighted programmer. Compare UBD; see also brain-damaged.


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

Programmer Brain Damage
PBD

    (PBD) A classification of a bug which was obviously
   introduced by an incompetent or short-sighted programmer.

   Compare UBD.  See also brain-damaged.

   (1996-10-13)