/W-I-M-P in-vī-rə(n)-mənt/
n. [acronymic from Window, Icon, Menu, Pointing device (or Pull-down menu)]
A graphical-user-interface-based environment such as X or the Macintosh interface, as described by a hacker who prefers command-line interfaces for their superior flexibility and extensibility.
See menuitis, user-obsequious.