The genitals of a male moth
Jim; Hey Sahra, Have you ever smelled moth balls before?
Sahra; Why yes I have.
Jim; Oh really, How did you get their little legs apart?
The painful state felt in the scrotum of males from the lack of sexual activity. This level of pain is desribed to be greater than the pain associated with blue balls.
Brian has not had sex in such a long time that he now has moth balls.