The group of people who worship the God Gustavo in an almost cult-like manner.(2 And/or pertaining to the arch enemies of the Gyuk Gang.
1)Guy 1: "I can't believe that just got into the Gustavo Gang!"

2) Guy 98: "The Gustavo Gang's gonna kick Gyuk gang's homosexual arse!"
by _nigr0s September 1, 2019
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