Cake or a cupcake that has been on the floor for some time. Someone must really have the sweets bad to pick it up and start eating it - but they do !
"Jeremy, your place is a mess. Wait, is that floorcake ! First dibs !"
"Look, Delancey. They're serving floorcakes." (as spoken by Portia in, "Barbie Princess Charm School.")
The act of engaging in romantic/scandalous activity 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 up with that girl Hannah from down the hall.