From olde English dogs, to immoral women, to weak men, to irritating women, to its prideful reclaiming, to ownership over a woman (there's a theme here), the word "b*tch" has a long and fascinating history, and it's all stored in the archives of the Merriam-Webster lexicography department.
Kory Stamper, a lexicographer at Merriam-Webster, spends all day reading citations and trying to define words like “Monophysite" and “bodice ripper." She has been doing this sort of thing since 1998, long enough to remember blue galleys, grease pencils, rubber stamps, and inter-office mail. Most recently, she's gained some notoriety for being one of three editors who write, edit, and appear in the “Ask the Editor" video series. (Pursuant to the video series: yes, her hair changes colors, and no, she will not marry you). In addition to working on definitions and (patiently, steadfastly) answering the editorial email, she sometimes travels around the country giving talks and lectures on things that only other word nerds would be interested in.
When she is not doing the word-nerd thing, she does other nerdy things, including knitting, baking, and live sound engineering. But she will probably not bore you to death with those things here.
You can read more of Kory's blabbing on the Merriam-Webster blog and in the Guardian, where British commentors endlessly complain on every column she has written there. She also occasionally contributes to Strong Language, a blog about foul language.
Her debut nonfiction book, Word by Word: The Secret Life of Dictionaries, was published in March 2017. Publishers Weekly called it “occasionally profane," which is delightful. She's working on another nonfiction book for Pantheon/Knopf, and that will also likely be occasionally profane.