As defined by the Jargon File, version 4.4.7, grok
is as follows: (I only copied sense 1, sense 2 has to do with non-humans groking things).
grok: /grok/, /grohk/, vt.
[common; from the novel Stranger in a Strange Land, by Robert A. Heinlein, where it is a Martian word meaning literally "to drink" and metaphorically "to be one with"] The emphatic form is grok in fullness.
1. To understand. Connotes intimate and exhaustive knowledge. When you claim to "grok" some knowledge or technique, you are asserting that you have not merely learned it in a detached instrumental way but that it has become part of you, part of your identity. For example, to say that you "know" LISP is simply to assert that you can code in it if necessary — but to say you "grok" LISP is to claim that you have deeply entered the world-view and spirit of the language, with the implication that it has transformed your view of programming. Contrast zen, which is similar supernal understanding experienced as a single brief flash.
Yes, I knew the movie was coming out at some point in the indeterminate future. Will see it. Hope and pray that it lives up to expectations, like LOTR, and doesn't flop like a drugged out hooker, like the Matrix trilogy.