Following sex with a girl on her period, this condition occurs when blood smeared on to your "nether regions" makes your pubic hair resemble the coloration of the wig worn by the 80s kid show clown bozo.
After having sex with Jill, Jack exclaimed: "My oh my, looks like Aunt Flow is in town because I have a serious case of bozo dick."
by midgetdeathtrain June 25, 2008