Short for the term "trinitario", a Dominican based gang found mainly in NJ and NY.
Ke lo que loko, 3ni all day
by ElCocoLoco September 19, 2008
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3ni is just another way to say trini (trinidadian). the way their accents are, pronounce the number "three" as "tree" so put them together and its "tree-ni" or "trini"
person 1: "hey, whats your nationality?"
person 2: "am 3ni baby"
by Manpreet123 March 10, 2008
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