The Free On-line Dictionary of Computing (19 January 2023):

Career Limiting Move
CLM

    (CLM, Sun) Any action endangering one's future
   prospects of getting plum projects and raises, and possibly
   one's job.  E.g. "His Halloween costume was a parody of his
   manager.  He won the prize for "best CLM"."  A severe bug
   discovered by a customer might be a "CLM bug".

   (2000-08-09)


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

CLM
 /C·L·M/

    [Sun: ‘Career Limiting Move’]

    1. n. An action endangering one's future prospects of getting plum projects
    and raises, and possibly one's job: “His Halloween costume was a parody of
    his manager. He won the prize for ‘best CLM’.”

    2. adj. Denotes extreme severity of a bug, discovered by a customer and
    obviously missed earlier because of poor testing: “That's a CLM bug!”