(BSOD) The infamous white-on-blue text screen which
appears when 
Microsoft Windows crashes.  BSOD is mostly seen
on the 16-bit systems such as 
Windows 3.1, but also on
Windows 95 and apparently even under 
Windows NT 4.  It is
most likely to be caused by a 
GPF, although Windows 95 can
do it if you've removed a required 
CD-ROM from the drive.
It is often impossible to recover cleanly from a BSOD.
The acronym BSOD is sometimes used as a verb, e.g. "
Windoze
just keeps BSODing on me today".