This one is best summed up with a selection of quotes from the seller...
"Many people have a mounted head on the wall, but can you actually say you have a butt on the wall."
"[...] this Butt is perfect in every detail, right down to the crack in his BUTT."
"The value of this unique BUTT is about $300.00"
Boy, somebody got an awfully good deal at only $90, then.
(Found by Mistress Sky)