Sukeban

 means "delinquent girl" or "boss girl" in Japanese, equivalent to the male "banchō". A dictionary of Japanese slang says that "sukeban" only refers to the leader of a girl gang, not any member of the girl gang.
Characteristics.
The common signifiers of "sukeban" (described by the Japanese police in 1980s pamphlets as "omens of downfall") include brightly dyed or permed hair, and modifications of the school uniform such as wearing coloured socks, rolling up the sleeves and lengthening the skirt. "Sukeban" are reported to engage in activities such as stimulant use, shoplifting, theft, and violence, but if arrested, they can be charged with the lesser offence of "pre-delinquency". The word "sukeban" was originally used by delinquents, but has been used by the general population since 1972.
Media depiction.
In the 1970s and 1980s, "sukeban" became popular characters in "seinen manga". "Sukeban" characters could also be seen in "shōjo manga" publications. "Sukeban Deka", "Tales of Yajikita College" and "Hana no Asuka-gumi!" were three popular "shōjo" series that had a mostly "sukeban" cast. 
Pink film director Norifumi Suzuki made the first films in the seven-film "Girl Boss" ("Sukeban") series. He also started the four-film "Terrifying Girls' High School" series (1971–1972) featuring "sukeban" characters. Both series featured prominent "Pinky violent" actresses Reiko Ike and Miki Sugimoto. On December 6, 2005, Panik House company released a four-disc region-1 DVD collection surveying "Sukeban" films entitled "The Pinky Violence Collection".