wixxx is a command, found in MUCKs, that displays sex-related "flags", and usually also custom flags and sometimes even more detailed information on character's sexual preferences (and perversions)...
A general rule in MUCKs seems to be that most people who have more than three or four lines of these "flags" can be safely ignored... =)
Some MUCKs (especially adult-themed MUCKs like Taps) fold the functionality of wixxx into wi, a command that's generally used to display not-that-sex-related flags.
See also: wi