A Gaka a word used to describe a person (usually a boy) that is quiet and mysterious, but once you get close to that person and they tell you their secrets you would wish you never met them.
girl: you see that boy over there?
other girl: you mean that gaka in the back of the class?
girl: yes he's so quiet. i'mma go talk to him
other girl: you better not! gakas are got some creepy secrets
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