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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.
by ministryoftruth December 18, 2011
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