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TIL a "rolling tray" is a tray designed specifically to aid in rolling joints.

Took me a couple of minutes, a google search, and then another couple of minutes to understand what a "rolling joint" is. (not native English speaker)

I'm not sure you got it, because you referenced it as a noun, not a verb.

Rolling is the verb, the joint is the noun.

Rolling a joint is rolling a cigarette, except with marijuana.

I did write the comment using it as noun, incorrectly, on purpose, to convey my confusion :)

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