Slap you're enemy day means that- IF you have an enemy, you can either wait for them to say something rude so you can slap them, OR, just walk up to them and slap them. (March 1 cannot be defined, March 1 is literally a date, SORRY URBAN DICTIONARY)
the day where all brats are born, the youngest in the family gets everything that they want but surprisingly not the favorite it usually her older sister.
My little sister is born on March 1st, she can totally relate to this disrcription.