Visible accumulated refuse like dead skin and taint hair which is found on public toilet seats.
"We need to go to a different rest stop, every toilet here is soaked in piss and covered in ass dandruff."
The nasty dust, skin, hair, and sometimes unidentifiable debris that are found in the crevices of a heavily used chair or couch.
Oh! Dude, it was so nasty! My pen fell in between the cushions on the couch in the lounge today and I couldn't get past all the ass dandruff to get it out.
Suspicious looking flakes of skin left on the toilet seat after a good clearout.
who's left half a pound of ass dandruff on the seat in trap 2 again!