Ooh, I like this. I think ‘oyster’ may be a female yob.I recently learned that -ster is an ending for female occupations. Spinster - spinning woman. Oyster - girl mussel. Gangster - women banding together for criminal activies. Not sure about the "hipster" one.
Also:
Monster - a woman born in Scotland.
Manchester - slang term for a female secondary sexual characteristic.
Master - formal term used when referring to one’s mother.
Postmaster - an elderly mother.
Minister - a short female person
Magister - one of the wise women who have unaccountably been left out of the official Nativity.
Quester - Manuel’s wife (sadly edited out of the broadcast episodes of Fawlty Towers).