A joint of marijuana rolled by someone who doesn't know how to roll proper joints. In the case of placing a large, not propeperly broken up amount of marijuana in the middle of the joint and rolling large points at the ends.
a. Wanna smoke this fat ass joint man?
b. Joint..? That's not a joint. That's a fucking chibby.
a. What's a chibby?
b. It means you should invest in a roller.