(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]