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Wiktionary
brain dump

alt. (context slang English) The transfer of a large quantity of information or knowledge from one person to another, as for example when one skilled employee is to replace another. n. (context slang English) The transfer of a large quantity of information or knowledge from one person to another, as for example when one skilled employee is to replace another.

Wikipedia
Brain dump

The phrase brain dump refers to these things:

  1. Generally, the transfer of a large quantity of information from one person to another or to a storage and retrieval medium is referred to as a 'brain dump'.
  2. In slang, it can describe a hurried explanation of a system, job, skillset, or other engineering subject.
  3. In computing, the phrase describes the taking of a snapshot of the internal state of a knowledge database for transfer or archiving purposes. Thus, the copying of any dataset might be called a 'brain dump' if its contents could be colloquially referred to as a 'brain'.