The hashtag #5HBOSSPreorderAtMidnight is lighting up twitter today.  And what exactly does 5HBOSSPreorderAtMidnight mean?  Well, that’s why were here for you.  To do all the hard research work.  #5HBOSSPreorderAtMidnight is all about the Fifth Harmony new single preorder that begins tonight. Of course, that brings up another question.  What/who is Fifth Harmony?  Good question, we didn’t know