A foof tube is a device made from scented dryer sheets, a cardboard tube, and a rubber band. It is used to mask the smell of smoke, usually marijuana
To make: Rubber band one dryer sheet to an end of the tube, and stuff the tube with the rest of the sheets. Smoke passing through this tube will smell laundry fresh!
Also known as a blow tube
"Man, smoking in my parents' basement can be sketch, but I use a foof tube and they're none the wiser!"