Mantle Piece 

A Build of of excrument (poo) around the RingPiece (bumhole) and forms a think layer of crust like the earths mantle hence the name mantlepiece

James McNeil has a large build up of scref (crusty poo) on his mantle piece

Mantle Piece by James McNeil May 13, 2006

mantlepiecing 

verb: To bring a photo of yourself (preferrably pre-framed) to a party at someone's house, then place the photo among other photos of host's family and such on a mantle or dresser. Popularized by a column on CollegeHumor.com, though some celebrity hairdresser douche claims credit.

As Heather was cleaning her house the morning after her New Year's party, she realized her dresser had been mantlepieced by Adam.

mantlepiecing by Adam January 1, 2005