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2.
A segfault is an Acces Violation, Segmentation Fault or Bus Error. Commonly caused by evil C++ programming and Dell hardware.

See Segmentation Fault
Program received signal SIGSEGV, Segmentation fault.
Switching to Thread -1222366304 (LWP 23368)]
0xb7bfdc63 in GSStrAppendUnichars () from /usr/GNUstep/System/Library/Libraries /libgnustep-base.so.1.13
(gdb) ^D
The program is running. Exit anyway? (y or n) y
Debugger finished
yar ~/dev $ aargh segfault
bash: aargh: command not found
yar ~/dev $
by YetAnotherRetard September 29, 2006
 
1.
A segfault is a term typically used by programmers to indicate that something has gotten f***ed up. While technically it means that a computer program has dereferenced bad memory, it can also be used in reference to sudden failures of anything.
"Hey my program just segfaulted"
"Bummer man"
by shamgar May 07, 2009