What is Greeble?
1.
Random bumps, extrusions, and hills and valleys, usually planar. Used in 3D modeling and animation to add interesting detail, like that on the surface of the DeathStar.
"Yo dog, that greeble modifier really pimped out your 3D model."
See
2.
Used to define something that is yucky or discusting, in the context of a gross body function, or an being with gross habits as a whole.
That runny nose child is a right greeble.
Dam your one messy greeble.