n. 1. Short for hexadecimal, base 16.
2. A 6-pack
of anything (compare quad, sense 2). Neither usage has
anything to do with magic or black art, though the pun is appreciated and occasionally used by hackers.
True story: As a
joke, some hackers once offered some surplus ICs for sale to be
worn as protective amulets against hostile magic. The chips were,
of course, hex inverters.