The book "Perl Best Practices" defines "grok" as understanding a portion of computer code in a profound way. It goes on to suggest that to "re-grok" code is to reload the intricacies of that portion of code into one's memory after some time has passed and all the details of it are no longer remembered. In that sense, "to grok" means to load everything into memory for immediate use. It is analogous to the way a processor caches memory for short term use, but the only implication by this reference was that it was something a human (or perhaps a Martian) would do.