The act of engaging in romantic/scandalousactivity with a person that lives on the same floor as you. Most commonly happens in college dorms or apartments.
person 1: So yeah, I started hooking upwith that girl Hannah from down the hall.
A sophisticated filing system where by important documents and personal belongings are kept/discarded directly on the floor for easy access, leaving the owner free to do more important things with her/his life than tidying.