While “Mean Girls Day” is being marked Wednesday in reference to a mention of Oct. 3 in the popular 2004 cult movie, the parents of a former Seneca Valley High School student claim in a federal lawsuit filed this week that their teenage son was terrorized by false accusations made by five “Mean Girls” at the school. Michael J. and Alecia Flood of Zelienople, Butler County, the parents of a teenage boy identified in the lawsuit as T.F., seek unspecified civil damages against the girls’ parents, the school district and Butler County District Attorney Richard Goldinger’s office. The lawsuit alleges...