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4.
1. To understand something intimately and completely. (originally from Stranger in a Strange Land, by Robert A. Heinlein)

2. With programs, having sufficient understanding.

Almost all C compilers grok the void type these days.
by tobym4 May 30, 2006
 
8.
To learn and understand how something works, typically through experimentation.
Have you tried to grok dojo?
by tabmow July 12, 2006
 
9.
To Grok is the sound one makes when their mouth is being abused consecutively with something large or foreign. This would most likely be a male sexual organ. After repetitive fast strokes, the receiver will be making the noise so called 'grok'.
I want to grok that girl in the face right now.

She groked my world last night.

She loves to give me grok grok.
by DINO CHAN September 03, 2009
 
10.
To dig. To be hip to.
"I grok you the most, baby."
"I grok Diz and Monk man."
"Grok this motherfucker." (usually used in combination with middle finger.)
by lened February 11, 2004