Ask the Webternets: female mustache-twirling

A couple of days ago, I was talking to minion_of_tevildo about a book I was reading, and observed that one of the female characters was a classic mustache-twirling vaudeville villain. "Or whatever the female equivalent of mustache twirling is", I added. Despite some further discussion, and even a visit to TV Tropes[1], we were unable to discover (or decide) what the female equivalent of mustache-twirling actually is, and are now turning to all the tiny people who live in my computerthe internet in hopes of an answer. Please, dear friends, what is the female equivalent of villainous mustache-twirling?


[1] which only mentions mustache-twirling in passing on the Dastardly Whiplash page, and shockingly fails to even consider the possibility of a female equivalent.