Moof

Moof /moof/  [MAC users] 1. n. The call of a
   semi-legendary creature, properly called the {dogcow}.  (Some
   previous version of this entry claimed, incorrectly, that Moof was
   the name of the *creature*.) 2. adj. Used to flag software
   that's a hack, something untested and on the edge.  On one Apple
   CD-ROM, certain folders such as "Tools & Apps (Moof!)" and
   "Development Platforms (Moof!)", are so marked to indicate that
   they contain software not fully tested or sanctioned by the powers
   that be.  When you open these folders you cross the boundary into
   hackerland.