vial of yellow slime
This is a small vial of yellow slime, which you collected from the remains of a dead ooze of some sort.
Presumably, you had the empty vial on you already -- I don't think the ooze in question was carrying around a little bottle of its own slime. That would be strange behavior for an ooze.
Unless it's some other ooze's slime, which it was carrying around as some sort of souvenir... I'm going to stop thinking about this now.
Selling Price: 33 Meat.
Cannot be traded
(In-game plural: vials of yellow slime)