Today is October 3rd, and if you were ever a high school girl, or know someone who was, you know exactly what that means. It is the day Aaron Samuels asked Cady Heron what day it was. It was, indeed, October 3rd.
Because of that one throwaway line, October 3rd has now become known as Mean Girls Day, or as it is written on social media, #MeanGirlsDay. People are spending today celebrating in the traditional way, which is to let everyone know what day it is. It is October 3rd.