Silverweed Oil was a substance retrieved from the Silverweed plant. It was used to get high. It's weed. It was primarily smoked, and inflicted the same sorts of behavior that a dank blunt might. Its primary source was Drunkeros Madagascar, which supplied Drunkeros with 85% of its Silverweed Oil supply. Most members of the Ätlän-tã Fælcons were quite partial to it, as was Bucky.
First Episode - Episode 105 - The Enkindling.