The Collaborative International Dictionary of English v.0.48:

Cube \Cube\, v. t. [imp. & p. p. Cubed (k[=u]bd); p. pr. & vb.
   n. Cubing.]
   To raise to the third power; to obtain the cube of.
   [1913 Webster]

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

cubing

    By analogy with "tubing", hacking on an IPSC (Intel
   Personal SuperComputer) hypercube.  "Louella's gone cubing
   *again*!!"

   [Jargon File]

   (2003-10-09)