"TERF" is short for "trans-exclusionary radical feminism", a misnomer by which gender essentialist reactionaries pretend to be egalitarian while in fact working to reinforce and reinvigorate rigid hierarchical social dichotomies – a form of false advocacy.
The acronym is more frequently used to refer to practitioners of this ideology, i.e. "Trans-Exclusionary Reactionary Feminist". Some less common but more accurate acronyms include TWERP ("Trans-Women-Excluding Reactionary Pseudofeminist") and FART ("Feminism-Appropriating Reactionary Transphobe").
- Wikipedia redirects to Feminist_views_on_transgender_topics#Feminist_exclusion_of_trans_women
Conservapedia; one mention in gender ideology: "While some feminists such as Judith Butler advocate gender ideology, not all feminists agree with it. There is a disagreement and vigorous war of words between transsexuals and radical feminists who do not accept biological men as "women". Transgenders have even created an acronym TERF meaning "trans-exclusionary radical feminist" which they use as a term of denunciation, hostility and abuse."
- 2018-02-15 [L..T] Transgender Women Aren't "Women" "I wanted to talk about the fact that I personally find it kind of offensive when transgender people don't own the fact that they're trans." Video is Tweeted, and much debate ensues.
- 2018-01-15 [L..T] Arsonist TERF thinks trans women are immoral & should be beaten "I’m quite prepared to threaten violence because it seems to me that politically what they’re seeking to do is piss on all women. That’s what they’re doing for their personal gratification. There aren’t many of them, but what really offends me is the extent to which academia and political parties have listened to them in a way that they’re not listening to us as women." – Linda Bellos
- 2017-04-04 [L..T] Are Butches Disappearing? (video) "I've had enough of anti-trans lesbians attacking me, or trying to "save" me, which is incredibly condescending and erases the years of research and soul-searching (I actually prefer soul-creation) I have done. So I wanted to put all my thoughts down into a (big) “bite sized” chunk here to direct them to when they start to vomit a word salad at me."
- 2015-04-13 [L..T] I guess I’m an MRA now First let me point out that the litte tweet I chirped out was because the TERFs were flocking to me — I hadn’t barged into one of their conversations, or invited them to explain to me what makes for a real woman, but there they were, in my space. So she doesn’t get to complain about me violating boundaries.
- hat-tip to @b0mb for this (with some discussion about its accuracy)