A 90's ninja is somebody that grew up in the 90's and is yet to leave their outdated trends behind them. Wardrobes may include sneakers that flash, orange headbands, and temporary spice girl tattoos.
Guy 1: "I think Fresh Prince is some of Will Smith's finest work."

Guy 2: "Dude, if you would take the N'sync out of your ears for one second you would realize all of the movies he has done since then. You are such 90's ninja."
by D-weezie October 12, 2009

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