An extremely unattractive female. Usually consisting of very frizzy hair, pale skin, overall dirt mcgirt look. Most likely this so called 'mudhen' will smell like ramen or instant mac n cheese. Most likely this person will also posses a kool aid stained shirt.
Guy#1: Yo Guy#2, did you see that chick over there?
Guy#2: Yeah man, she's a certifiable mudhen.