People Goo

noun (n.)
Any liquid, oil, or secretion that is created by the human body and has the ability to leave behind a stain or mark. More commonly thought of forms would be saliva, sweat, or blood (just to name a few). People Goo can easily be spotted on sleek surfaces such as glass, metal, or plastic, as well as lightly colored fabrics.

"You only borrowed my ipod for an hour, and it is terribly smudged with your People Goo."