pig night
n.— «One of its disgusted members told me of its annual practice called “pig night” when pledges were sent out to find “ugly townie girls” to be invited to a big Yale party—at midnight they were told, now illegally liquored up, that they had been invited as the worst pigs that could be found, then dismissed into the New Haven winter.» —“Frat Boys Torture, Too” by Ed Kent Blogger News Network Oct. 4, 2007. (source: Double-Tongued Dictionary)