dirt ring

The visual display of a combination of sweat, crystal meth residue, cat urine, and hair grease formed into a ring that circles one's neck. Most commonly found on hitchikers, Michael Moore followers, hippies, and homeless bums. The worst cases of this can even be seen on a black shirt, although most are seen on "Bush is the devil" semi-white t-shirts. Although this is a visual phenomenon, one usually knows of an approaching dirt ring simply by the smell of sour sausage and dirty socks. For best examples of this occurrence, spend some time in the greater San Francisco area or in Greenwich Village.