ginornament 

A Christmas ornament of large, or ginormous, size. Often seen on large Christmas trees in public places like malls.

Whenever I go to rich people's houses during the holidays, I love to see the ginornaments on their Christmas trees.

ginornament by Amaranthian December 25, 2009

gornament

A huge, oversized glass Christmas ornament, on average about 200 millimeters in diameter. Commercially available in specialty and big-box warehouse stores, and almost exclusively bought by shopping-mall holiday decorators and people with 50-foot pine trees in their yard.

A combination of Gorn (as in the Lizard People on Star Trek) + ornament.

I need 30 4-packs of gornaments. They're for the story-high wreath behind Santa's throne at Briarwood Mall.

gornament by BazingaBabe December 14, 2010

Guitornament 

A guitar owned by someone that cannot play. Often these are obtained in by people who intend to learn, but never muster the motivation to begin/persist.

Steve: Do you know anyone selling an old guitar? I would really like to learn.
John: Ask Peter, he's got a guitornament by the fish tank.

Guitornament by Juanaso September 1, 2013