Actually, it's my "ten in the evening and smelly from being a total bum all day" face.
See how Sim-Me is inside a house for once in her life? Yeah, she stayed over with a friend who has an actual residence with four walls and a street address and everything...and in the span of two days she managed to break two toilets and a rather expensive computer.
This is why a lean-to is Sim-Me's choice of residence. I am apparently not fit to mingle with civilized society.