Related:

• vadding /vad'ing/ n. [from VAD, a permutation of ADV (i.
  e., ADVENT), used to avoid a particular admin's continual search-and-destroy sweeps for the game] A leisure-time activity of certain hackers involving the covert exploration of the `secret' parts of large buildings -- basements, roofs, freight elevators, maintenance crawlways, steam tunnels, and the like....
• hack [very common] 1. n. Originally, a quick job that produces what is needed, but not well.
  2. n. An incredibly good, and perhaps very time-consuming, piece of work that produces exactly what is needed....
• phreaking: /freek'ing/ [from `phone phreak'] n. 1. The art and science of cracking the phone network (so as, for example, to make free long-distance calls).
  2. By extension, security-cracking in any other context (especially, but not exclusively, on communications networks) (see {cracking})....
• down: 1. adj. Not operating. "The up escalator is down" is considered a humorous thing to say
  and "The elevator is down" always means "The elevator isn't working" and never refers to what floor the elevator is on....
• phreaking /freek'ing/ n. [from `phone phreak'] 1.
  The art and science of cracking the phone network (so as, for example, to make free long-distance calls)....
• down 1. adj. Not operating. "The up escalator is down" is considered a humorous thing to say (unless of course you were expecting to use it)
  and "The elevator is down" always means "The elevator isn't working" and never refers to what floor the elevator is on....
• bug n. An unwanted and unintended property of a program or piece of hardware, esp.
  one that causes it to malfunction. Antonym of feature....
• metasyntactic variable n. A name used in examples and understood to stand for whatever thing is under discussion, or any random member of a class of things under discussion.
  The word foo is the canonical example. To avoid confusion, hackers never (well, hardly ever) use `foo' or other words like it as permanent names for anything....
• ADVENT: /ad'vent/ n. The prototypical computer adventure game
  first implemented on the {PDP-10} by Will Crowther as an attempt at computer-refereed fantasy gaming, and expanded into a puzzle-oriented game by Don Woods....