Trailer Jaw?

Maybe like a weak chin?

Commonly noticed on the outside of trailers. Occupants are seen sitting on a fold-up chair, bench or sometimes a upside down bucket staring blankly at what seems like nothing, with their mouth halfway open. This condition often progresses to this facial expression remaining no matter what they are doing.

look up lock jaw

quote:

---

Commonly noticed on the outside of trailers. Occupants are seen sitting on a fold-up chair, bench or sometimes a upside down bucket staring blankly at what seems like nothing,

---

you just described Rodie from Killing Fields