What does "Fatty" mean?

Definition: A large joint or spliff. Usually, if you're going to smoke a fatty, your goal is to get extremely high. Fattys are often also considered to be cones, but not 100% of the time — it is definitely possible to roll an extremely fat, but straight-lined joint.

Example usage for Fatty

"That fatty is the fattiest fatty I've ever laid eyes on. Let's get ripped."