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An eating disorder that can occur up to a year, but usually a month before Prom. Mainly occuring in young women, characterized by a self-induced starvation in order to fit into their Prom dresses or feel better about buying a slightly smaller size (which never works). Exercise in the form of "Prom night sex" usually follows Promorexia.
Will: "Dude, none of the girls are eating lunch."

John: "Yeah man, it's a month to Prom: Promorexia season."
by HiBillyMaysHere October 30, 2011
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