100 refers to the state of keeping it real or being completely honest about a situation. Gun it refers to destroying something. Therefore to 100 or gun it means that either you keep it real or prepare to die.
Guy 1: What's up homey? Did you hear about John?
Guy 2: Naw kill that ish, I 100 or gun it.
It's when people stereotype gangs without knowing the real purpose of the organization or anything about it.
Person 1: Man, all bloods do is rob people. That is what they stand for.
Person 2: That's so gangist, you don't know no bloods.
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