Used in Adventure Time, it is the equivalent of a fable or story, presumably in Cuber's language.

A cultural and aesthetic mind-state that prioritizes making money, even as an “underground” or “radical” creator. The work isn’t made for money, but it’s the money that matters the most.

A short story or tale. Often presented in the future regailing tales from the distant past.

A fictional object that looks like a floating cube, pyramid, cylinder, etc. It can be used as a toy to watch a group of short videos. The point of the videos is to try to guess the theme of them. It could be something like "the five fingers" or "the five senses" or something like that. Graybles can also be used for emergencies. If you are in danger and you watch a grayble, it will show you a way to get out of danger. It might show an event that happened to someone else in that same place and you can learn from their mistakes or their successes, but you never really know with a grayble. Graybles almost seem like they have a mind of their own.