The after effects of butt-fucking

the greasy, stank,grayish brown crud that collects in the taint area after a day's worth of vigorous activity in the blazing heat. It consists of back sweat, lotion, possibly sunblock and hair products, and of course liquidated fecal matter.

The result of shooting a load into a chicks ass while she's shitting on your dick. Similar to a dirty sanchez on your cock, or to a shit dick, but with more liquid.