Very small left-over particles of marijuana.

Grunyuns are created from the process of breaking down buds, rolling joints or blunts, or packing pipes & bongs.

The term shake is a comparable synonym.
"Dude don't throw that out! You know i save all the grunyuns!"

"If I want to smoke bad enough, I scrape together all the grunyuns I can find"

"Ehhh BOBO!! lemme get them grunyuns when you get done rolling that blunt!
by Sir Moose October 07, 2011
The crumbs of chips and flavoring at the bottom of a bag of chips.
Hey man, you gonna eat those grunyuns?
by teaddub November 01, 2014

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