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A fraternity or sorority event in which the members usually aren't notified of the even until close to when it will happen, so they must "dash" to get a date. Most fraternity ones are just drinking with your date in matching, themed t-shirts.
Suzie: I just got invited to a Sigma Pi fraternity date dash.
Jenny: Are you gonna go?
Suzie: Of course! Free alcohol and a free shirt.
by EmTem December 20, 2011
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