LOLOL! Well, there's the Facebook group MFW, but they only use the term "witches" as a figure of speech, while leading boycotts against sexist radio announcers, among others.
https://www.facebook.com/MadFckingWitches/
Otherwise, you take me straight back to the old school text.
"How now, you secret, black, and midnight hags?
What is ’t you do?"
"A deed without a name."
So...you better look out, Brian!
'"Aroint thee, witch!” the rump-fed runnion cries.
Her husband’s to Aleppo gone, master o' th' Tiger;
But in a sieve I’ll thither sail,
And like a rat without a tail,
I’ll do, I’ll do, and I’ll do.'