Used mostly in the Baltimore area, a blood traitor is a girl that dates from a "forbidden" school. "Forbidden" schools include but are not limited to: Boys Latin Calvert Cathedral St. Pauls School for Boys Most of the "offenders" either go to Bryn Mawr (BMS) or Calvert.
Alice: God, can you believe Lilly's dating a BL guy? Kristen: I know. She's such a blood traitor. Remember the Calvert guy she dated?
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