It's to get hype or fired up and/or go crazy. You can go gorilla when you're happy or angry, sort of like beast mode. Check it.
Example 1 (angry): When my lil bro broke my football trophy I went gorilla on his black ass.

Example 2 (hype/happy): Our whole team started to go gorilla when we scored a much needed touch down.
by Thankyoubasedgod November 25, 2012

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