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1.
Red Cup Pictures are photos, traditionally appearing on Facebook, which generally depict some sort of partying. The etymology of the term comes from the fact that most of these photos show one or more people holding red plastic disposable cups which are commonly used for alcoholic beverages at youth gatherings.
Rachel: I just looked through all of my facebook "added by others" pictures. What a pleasant walk down memory lane!

Michael: How many Red Cup pictures?

Rachel: Too many.
by MichaelJohnston March 24, 2008