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1.
Another term or name for a Redneck or Southern Hick, especially one that is loyal to the Confederacy. This word is derived from the color of the jacket that Southern soldiers wore when fighting for the Confederacy during the Civil War.
The great part about calling a redneck this is that most of them are too dumb to realize that this is an insult. But that is also because no one today has ever used it frequently, if they ever have.
Hey! Quit yakkin, you grayback; my ears are starting ta bleed.
by The Kentucky Yankee August 12, 2004
 
2.
A middle aged person who is most often believes in adultism and seek to keep the status quo in society which is lame. society should be changed. They are against anything that gives teens pleasure like orgied,rainbow parties,pot ect. and they want to keep an eye on them at all times like big brother. The government is mostly run by gray backs. Also gray backs think teens and most other young people for that matter are in fact retarded and can't think for themselves that is unless they think the same way they do.

The term gray back comes from the word silverback which is an older dominate gorilla and the word gray means that they are old.
Those fucking gray backs!
by Deep blue 2012 April 04, 2010