Short for Joint Smoking Bob. Alternative way of smoking that is becoming increasingly popular in the NYC region. Instead of simply using a water bong or joint paper, the user combines the two and makes a water bong that smokes joints. The bong is typically decorated in various ways that work to imply that the joint itself is high AND smoking the joint with you. Great accessory for those without friends.
Whoa you smoking with that JSB? Now you won't ever be lonely!