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Sometimes used by members of sororities as well as those who are not affiliated to describe actions of a single member or entire sorority. It is the sarcastic combination of the words sorority and fantastic that sorority women commonly use when describing the perpetuation of the sorority girl stereotype.
girl 1: So I heard that Jessica is spreading rumors about Tiffany behind her back.

girl 2: Yeah, its pretty sororitastic.
by Chello22 June 18, 2011