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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."
by Matthew Highison December 07, 2005
 
2.
The small, spherical particles made by rubbing boogers in a circular motion between the thumb and index finger. This is typically done after picking ones nose in order to discard the boogers (particularly when there is nothing on which to whipe your finger).

An important characteristic of greebles is that, after drying, they become hard. This gives them a scratchy or abrasive quality which makes them undesirable when deposited in bed sheets or on couch cushions.
Dude #1: Dude!? Quit getting your greebles in my car!

Dude #2: What do you want me to do, bro? Wipe it on my jeans?
by Bravo Golf Hotel September 13, 2013
 
3.
germs, coodies, nasty unseen bacteria, yuckies, mcnasties
that hitchhiker i picked up left his ass greebles all over the back seat of my car! go take a shower and wash off all those sweat greebles!
by mr stickel February 26, 2010
 
4.
A heinous person.
Look at that gross girl.

Don't make fun, she can't help that she's such a greeble.
by socky72 January 03, 2011
 
5.
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.
by Lee Saunders January 19, 2005