cube = C = cup holder
[parallel with `tubing'] 1. Hacking on an IPSC (Intel Personal SuperComputer) hypercube. "Louella's gone cubing again!!" 2. Hacking Rubik's Cube or related puzzles, either physically or mathematically. 3. An indescribable form of self-torture (see sense 1 or 2).
--The Jargon File version 4.3.1, ed. ESR, this entry manually entered by rootbeer277.