From Jargon File (4.3.1, 29 Jun 2001) :
WIMP environment n. [acronym: `Window, Icon, Menu, Pointing device (or
Pull-down menu)'] A graphical-user-interface environment such as X or
the Macintosh interface, esp. as described by a hacker who prefers
command-line interfaces for their superior flexibility and
extensibility. However, it is also used without negative connotations;
one must pay attention to voice tone and other signals to interpret
correctly. See menuitis, user-obsequious.
From The Free On-line Dictionary of Computing (27 SEP 03) :
WIMP environment
WIMP