A small, mouse-shaped deposit formed in the vaginal cleft, usually of poorer women who did not wear undergarments - common until the nineteenth century. A sootikin built up over several weeks, even months, of not washing. It was composed of particles of soot, dirt, sweat, smegma (qv) and vaginal and menstrual discharge. When it reached a certain size and weight, it tended to work loose and drop from under the woman's skirt.
Sis....is that your clit or are you sporting a sootikin???