Someone who has an addiction to shredding paper or cardboard using an electric shredder.
"Do you know that geezer Gary from the crib down the road?"
"Yea dude: He's a shredaholic."
A person who is severly addicted to shred guitar playing, either by playing themselves or listening to.
Dude, Im such a shredaholic that I'll start going through withdrawls if I don't hear some good guitar playing soon!