Conveying all
relevant knowledge in a very brief period of time at a very high bandwidth. Braindumps are often used to give someone unfamiliar with a
codebase,
hardware architecture,
etc. enough knowledge to get
started on something.
In the
geek community braindumps are often used out of necessity because of a
combination of
short attention span and the distraction of other,
competing interests aka
The Internet.