What is 5 Oclock Shadow?
When, somehow, a little bit of shit ends up on the underside of the tip of a penis.
When a man sitting on a toilet after takin a crap wipes his ass from back to front. And without realizing it brushes his soiled tissue under the tip of his penis. As his partner later on unzips and strips him, he or she, while looking at his unit straight in the eye, notices a 5 oclock shadow.