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

frob
 /frob/

    1. n. [MIT; very common] The TMRC definition was ?FROB = a protruding arm
    or trunnion?; by metaphoric extension, a frob is any random small thing; an
    object that you can comfortably hold in one hand; something you can frob
    (sense 2). See frobnitz.

    2. vt. Abbreviated form of frobnicate.

    3. [from the MUD world] A command on some MUDs that changes a player's
    experience level (this can be used to make wizards); also, to request 
    wizard privileges on the ?professional courtesy? grounds that one is a
    wizard elsewhere. The command is actually ?frobnicate? but is universally
    abbreviated to the shorter form.


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

frob

   /frob/ 1.  [MIT] The TMRC definition was "FROB = a
   protruding arm or trunnion"; by metaphoric extension, a "frob"
   is any random small thing; an object that you can comfortably
   hold in one hand; something you can frob (sense 2).  See
   frobnitz.

   2. Abbreviated form of frobnicate.

   3. [MUD] A command on some MUDs that changes a player's
   experience level (this can be used to make wizards); also, to
   request wizard privileges on the "professional courtesy"
   grounds that one is a wizard elsewhere.  The command is
   actually "frobnicate" but is universally abbreviated to the
   shorter form.

   [Jargon File]