A person who is exceptionally clever, gifted or skilled in a particular area.
a maths wiz
(Internet, informal) A wizard; an administrator of a multi-user dungeon.
One notorious trick in less reputable corners of the MUD universe is to talk somebody into going into a dark corner of a MUD for some tinysex — dirty talking via computer screen, within character for the MUD, along with explicit posing — a dark corner where some invisible wizzes are hiding. 2000, Howard Rheingold, The Virtual Community, revised edition, page 154:
The wizzes are only the junior grade of the MUD illuminati. The people who attain the senior grade of MUD freemasonry by starting their own MUD, with all due hubris, are known as gods. 2003, David Lojek, Emote to the Max, page 11: