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1.
One who thinks he is stunningly handsome, but usually looks like a fag
When asked to define himself, Robby said he was stunningly handsome. We all laughed, knowing that kid was such a Greber.
von Mike Dade 13. März 2008
 
2.
being sophisticated, the ability to do mental math. Also the ability to have telekinesis;meaning motion, movement; literally "mind-movement.
How did you become such a Grebers little child?
von Conna G. 29. Dezember 2010