1. n. The call of a semi-legendary creature, properly called the dogcow. (Some previous versions 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.
3. v. On the Microsoft Network, the term ‘moof’ has gained popularity as a verb meaning ‘to be suddenly disconnected by the system’. One might say “I got moofed”.