Clay is generally used in runescape by the jews and junglebunnies. They hang around mining areas in varrock, and lumbridge, hoping to catch a glimpse of this prized gunk. When they have achieved their goal of apphrenending a few globs of clay, they like to bend each other over and cram as much of it up their anus as humanly possible. This enables them to run faster, due to the added 2.kg of momentum.
^ LOL. dafuq?