To build your forearms and grip strength, you need to train all three grip functions: support, crushing, and pinching strength. This exercise will take care of the last two categories.
These build significant functional strength and hypertrophy throughout the entire musculature of the forearms, not to mention Herculean grip strength. Note the pause at the top and bottom of each rep.
Other exercises include: fat grip lifts, plate pinching drills, towel pull-ups, rope climbing, rope pulling, and hex dumbbell pinching exercises. (More info here: Freaky Forearm Training.)
For several years, I was the Watson to Strength Coach Charles Poliquin's Sherlock Holmes. I chronicled his theories, revelations and discoveries. I like to think I played a small part in his success but in all probability, guys like Charles don't need any help; they get famous all on their own.
Thibs thinks you're looking kind of small lately. Says your girlfriend's been bad-mouthing your physique, too. Fortunately, he's taken pity on you and come up with some new movements for you to try.