A joint is a rolled cigarette filled with marijuana. Typically speaking, one would roll a joint with very thin clean-burning rolling papers. This specific way to smoke bud is popular because it’s easy to roll (almost) anywhere, portable and effortless to discard. There are countless ways to roll a spliff, doobie, cone, etc., including smaller pinners and self-described fatties.
“Tell Ben to roll a few doobies before our hike later. I want to be prepared.”