Definition of "grok"
grok
/ˈɡɹɒk/
verb
third-person singular simple present groks, present participle grokking or groking, simple past and past participle grokked or groked
(transitive, slang) To understand (something) intuitively, to know (something) without having to think intellectually.
(transitive, slang) To fully and completely understand something in all of its details and intricacies.