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The demographic of private- or parochial-schooled people, usually white females, who act in an excessively flamboyant manner, usually with some degree of sexual promiscuity. Derived from the typical color/pattern of schoolgirl uniforms.
What a bimbo! I bet she was top of her class in her Plaid Society.
by Aamir al-Loki April 26, 2011
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