rusty copper bottom
This condition occurs when a female who is currently on her menstrual cycle, suffers from severe hygiene issues. This leaves a scent of copper which can be smelled without trying. Also, it creates a rust colored lining in the persons underwear, therefor creating the appearance of a copper bottom.
That girl ain't showered in so long that I can smell the wishing well in Rusty Copper bottoms jockeys!