A hallway prostitute is some one who acts like a whore during school, or any other place with halls. this person well be very flirty and try to act sexy, in hallways, or buildings.
john: did you see jenni today?
nick: no why?
john: I heard she tried to have sex with coach dale so she could skip p.e for the rest of the year.
nick: wow shes got to stop being such a hallway prostitute.