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....