Jellyfying: When something is entering a state of being jelly, cool, something that would make one jealous
Jellyfying is a word with multiple definitions. It's meaning is what you interpret it as, according to the context.
Example 1-
John: Yo that concert last night was totally jellyfying
Example 2-
Kathy: Her butt is so jellyfying. I want one as big as hers.
Example 3-
Cook: The mixture is now to be put in the freezer in order to jellyfy. Whilst it is jellyfying, let's start working on the toppings.