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What does “Grinder” mean?

Definition: A device that’s used to break up marijuana. Typically people want to grind their marijuana for one of two reasons. One, it’s easier to roll ground marijuana into a joint. And two, ground marijuana burns more evenly in a bowl. It’s possible to grind marijuana by hand, but often that gets your hands sticky and smelly. Grinders usually have either nails or wooden poles on the inside. They need to be cleaned regularly.

Example usage for Grinder

“Your hands are nasty. If you want to keep rolling joints, you really need to get a grinder.”