What does b tube mean?

b tube meaning in Urban Dictionary

a homemade building, usually made of a liquid container or a rest room paper roll; the purpose for a b-tube is exchange the odor of marijuanna for that of textile softner. A b-tube is constructed of a tube with items of fabric softner inside. The word b-tube features derrived from 'bounce tube,' refereing to Bounce, a fabric softner company.