Skedungus
An odd grayish grainy substance found mashed in the corners of every barracks room. Consisting primarily of sand, crumbs, hygiene products, and abnormally large amounts of pubic hair. There is no known effective tool for fighting this infestation of filth except for flashfloods and flamethrowers.
So I walk in here on field day expecting to find a clean marine barracks room, but after flipping three of your wall lockers I came out with two raging fistfulls of SKEDUNGUS! EPIC FAIL!