Filk
Filk, also known as ferret milk, is a white, slightly sticky substance that is sourced from ferrets. The taste and look of filk strongly resembles cow milk, but it's not quite the same. There is no available information about the chemical composition of filk, but allegedly it is very healthy for humans and goblins. There is no known scientific evidence for this claim yet.
Source
It is currently unclear how this mysterious substance gets sourced from ferrets.
One of the most prominent theories from the PirateSoftware community is that it gets milked from ferrets. It is believed that the only person on earth who knows how ferrets can be milked is Jason "Thor" Hall.
Common usage cases
Filk is commonly used in making puppy pancakes and puppy cakes. It can also be drunk as a stand-alone drink, just like cow milk.
Surveys say that people who consume filk usually prefer filk over regular cow milk and are more likely to choose filk again in the future. About 69% of the people who took the surveys said they would choose filk again in the future.
Filk is a very popular part of the food culture of the goblin community.
A shady network dealing in underground animal substances on the darknet was busted by Thor in 2019. It was called the Filk Road.
Thor also plays bass in an amateur black metal band called Cradle of Filk.