Thats a term used for when guys bag up babania in "tin foil'.... it's sometimes called "tins"
You never that term before? Maybe thats a real NY thing. But its a thing!
They're called "Decks". You go up to Inwood trying to cop a "Tin" and they're going to hit you in the head with a box of Sucrets.
A "bag" is one thing. A "tin" is essentially the same thing but in a "tinfoil" as I said. But a "deck" is 10 bags of junk wrapped in a "bundle" for your information. (plus I never hung in Inwood in my lifetime. we don't hang in those shit-box areas ....(I also suspect I'm just a 'wee' bit older than you my man). Lol, so there's also a generation gap going on I suspect.