Wall Grease

The sticky brown spots on home walls that defy any logical explanation for it's existence. Called "grease" because of it's similar quality to congealed grease around the home stove. Can also be called "wall sap" or "wall sweat" because of how it appears to have oozed from the wall itself.

"Man, I found some wall grease again in my bedroom! Where the fuck is it comin' from?"