An excessively large or
thick makeshift toilet seat cover constructed from very many interleaved strips of toilet paper placed around the seat
rim. So called because of the resemblance to the nest of a very large
bird.
Created by persons using a public
toilet who cannot bear to have their buttocks touch the seat when a disposable cover is not available, or though to be too small, thin or flimsy to be effective.
Usually seen by others when the creator leaves the construction un-flushed and in-place on the seat after departing the public restroom.