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A crummy, do-it-yourself smoke tool, usually made from a water bottle or a toilet paper roll. It’s used to switch the stank of weed with the fakey smell of fabric softener, like a backstab from a friend.
My b-tube smells like my grandma’s laundry room. I’m not even high anymore.
I tried to use a b-tube, but it just made my mom yell at me.
I made my b-tube out of a sock. It works, but it’s weird.