“Weird bug make weird poop.”
–Wolfgang.
Glommer's Goop is an item dropped by Glommers periodically every 2-4 days or when they're killed. Other than its use as fuel for a Fire (equivalent to Boards), it can be eaten, providing 40 health and around 9 hunger, but decreasing sanity by 50. It can also be used as a Fertilizer for Farming.
Glommer's Goop is a good way to go insane when trying to kill Shadow Creatures for Nightmare Fuel or farming Beardlings. Its high fuel value makes it an ideal fuel for Ice Flingomatics.