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Popular add-on to the end of your graffiti crew's(squad, mob, posse, clique, gang, etc...) acronym name. Identifies your squad as number one (or at least u think so). Popularized on the east coast (philadelphia area) in the 1990's. Commonly written on walls directly after the name of your crew. Not designated for strictly graffiti gangs, but also written by gangs that graffiti (these are two very different groups of people).
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