Missing your pencil is to be bitchy and pissy for no good reason.
Comes from the joke : You know a woman is having a bad day when her tampon is behind her ear and she's missing her pencil
May be used for both male and female
Sara: GOSH! EVERYBODY SHUT UP!
Marissa: whats your problem? missing your pencil?
Damn, Mr. A was seriously missing his pencil in class today. He gave me detention for accidentally dropping my notebook.