In the Lego online community, greeblies are the intricate details on the sides of spaceships and sci-fi MOCs that define the mechanics and workings of what the MOC is meant to be. They were famously used in the giant Star Destroyer Lego set a few years ago, and also in the more recent Death Star II set. Plates with rails are often used for greeblies because they have a protrusion that only sticks out half a stud without needing a jumper plate. (source: Brickspace.org)
by 'John February 15, 2009

by Brian farthole May 29, 2005

After the floor is mopped you should sweep it again to get all the greeblies that the mop leaves behind.
Also if you don't rinse the dishes before you put them in the dish washer, there will be greeblies left on them.
Also if you don't rinse the dishes before you put them in the dish washer, there will be greeblies left on them.
by Nikki Cook April 16, 2006

The creatures that cats chase and wrestle with. Greeblies are invisible to humans. They are mainly nocturnal creatures, but have been known to be active during the day.
by jwbookworm February 26, 2009

by Pomo June 27, 2006

by 3daltons September 23, 2005

