(The act of telling someone) everything one knows about a particular topic. 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." At Sun, this is also known as "TOI" (transfer of infORmation). [Jargon File]