based on the ads for Diamond Shreddies, it means to argue over things that are basically the same.
"Dude, that's a circle,"
"Naw man, it's an oval!"
" Oh, come on stop fighting over shreddies!"

"Is that a husky-terrier, or a husky-poodle?"
"Dude, it's a dog, don't fight over shreddies."
by Halo Foxboy April 30, 2010
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