B line - A B line is a smelly hemp string soaked in beeswax, used to

A B line is a smelly hemp string soaked in beeswax, used to light up bongs. It’s like using a burnt matchstick to light a fart.

I used a B line to light my bong and it tasted like honey and regret.

That B line was so old it smelled like my uncle’s sock drawer.

She used a B line and it made the smoke taste like honey and heartburn.