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1.
Population of children born 9 months after the release of the Shades of Grey books.
"There are so many Greybies named Christian"
by Elinor G. June 12, 2012
 
2.
Is what a young person would call an old person that likes or is attracted to young people.
That woman is old enough to be my grandma. Just a greyby trying to make me her baby.
by LennyLen August 12, 2007