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The mental state of individuals that drive Mustangs(new or old).Often seen as taking risks that people driving other, less godly cars would take.
Guy 1: I hate riding with Michael in his mustang.
Guy 2: Why?
Guy 1: He has a bad case of Mustang Mentality. When ever he has to get on the highway he always pulls out no matter how close on coming traffic is.
by ghandi99 July 10, 2008
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