(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]