A tattoo used to identify sexually loose females.
Tattoo or "Mark" a.k.a. "Coaster" is located on the lower portion of females back. Usually the tattoo is of a butterfly or tribal design, sometimes both.
It can be helpful when trying to avoid the diseased sluts in a bar circuit. Most young woman who carry the mark also carry S.T.D.'s.
"She has a huge mark of the whore."