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

gritch

   /grich/ 1.  A complaint (often caused by a glitch).

   2. To complain.  Often verb-doubled: "Gritch gritch".

   3. A synonym for glitch (as verb or noun).

   (1995-01-31)


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

gritch
 /grich/

    [MIT]

    1. n. A complaint (often caused by a glitch).

    2. vi. To complain. Often verb-doubled: “Gritch gritch”.

    3. A synonym for glitch (as verb or noun).

    Interestingly, this word seems to have a separate history from glitch,
    with which it is often confused. Back in the early 1960s, when ‘glitch’ was
    strictly a hardware-tech's term of art, the Burton House dorm at M.I.T.
    maintained a “Gritch Book”, a blank volume, into which the residents
    hand-wrote complaints, suggestions, and witticisms. Previous years' volumes
    of this tradition were maintained, dating back to antiquity. The word “
    gritch” was described as a portmanteau of “gripe” and “bitch”. Thus, sense
    3 above is at least historically incorrect.