This is the Jargon File, a comprehensive compendium of hacker slang illuminating many aspects of hackish tradition, folklore, and humor.
brain dump n.
[common] The act of telling someone everything one knows about a particular topic or project. Typically used when someone is going to let a new party maintain a piece of code. Conceptually analogous to an operating system core dump in that it saves a lot of useful state before an exit. “You’ll have to give me a brain dump on FOOBAR before you start your new job at HackerCorp.” See core dump (sense 4). At Sun, this is also known as `TOI’ (transfer of information).
This is The New Hacker’s Dictionary.
In case you aren’t familiar with it, this is no snoozer dictionary of technical terms, although you’ll certainly find accurate definitions for most techie jargon. It’s the slang and secret language among computer jocks that offers the most fun.