Just finishing up Stranger in a strange land and I'm so surprised to see 'grok' on this context. I don't think I've ever seen the word before in my life. Pretty awesome.
One of my civil engineering friends said something similar the other day when I used "grok" in a conversation, and I was somewhat surprised because programmers have been using it in conversation for years (http://www.catb.org/jargon/html/G/grok.html). Evidently grok still has some pervading to do.
I use it for when I completely understand a skill. On the continuum from unconscious incompetence -> conscious incompetence -> conscious competence -> unconscious competence I see it as the last step.
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