A person,
generally an oafish male who walks around with an empty styrofoam
container in his satchel/briefcase/bag and only realizes it
the next day, presumably while packing said satchel/briefcase/bag for the day.
Bartender 1: That stupid rhude boy was went
all the way home with stinky leftovers in a stryofoam
container just jammed into his laptop case.
Bartender 2: What a biatch!