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The large black X's used to mark the back of a minor's hands upon entering a club or bar to let the bartenders know they are underage. Sometimes accompanied by Minor Shackles.
Girl #1: I gotta get to a bathroom and scrub off these Minor Marks.

Girl #2: It's no use. They use permanent marker. Looks like you're staying sober tonight.
by Totally_AL January 17, 2010