glark /glark/ vt. To figure something out from context. "The System III
   manuals are pretty poor, but you can generally glark the meaning from
   context." Interestingly, the word was originally `glork'; the context
   was "This gubblick contains many nonsklarkish English flutzpahs, but the
   overall pluggandisp can be glorked [sic] from context" (David Moser,
   quoted by Douglas Hofstadter in his "Metamagical Themas" column in the
   January 1981 "Scientific American"). It is conjectured that hacker usage
   mutated the verb to `glark' because {glork} was already an established
   jargon term (some hackers do report using the original term). Compare
   {grok}, {zen}.


Source: The Jargon File