The term
The term applies to so-called "radical" feminists who are not supportive of transgender advocates mainly. So, they lean politically "left" but do not go along with all the Gender Identity nonsense. Think of them of as sane Lesbians opposing people who have clearly lost their collective minds. This all came to a head, pun intended, when Lesbians were told they needed to consider dating trans women and if they did not, they are bigots.
Gay men and women do NOT want a "trans" partner. FULL STOP! The sexuality is baked into SAME SEX ATTRACTION.
So, Terf's got angry at being told they had to date women with penises for the sake of inclusivity. The insanity never ends... and of course... the TERF are the bad one since they don't play along with the mass delusions infecting our society today. Oh, and just for fun, a Lesbian who does date a trans woman is still in a lesbian relationship even though her new partner brings something a little different to the relationship. (I'll leave you to work out the hilarious mental gymnastics required here.)
Lastly, the term is ALWAYS used as a pejorative and with more than a measure of disdain, imbuing the speaker with an imagined sense of superiority.
Hope this helps.
@icehorse
Another amusing feature of this term is found in the term "radical". In my view, it's a play on words, in that the proponents of the term are implying that these feminists have been "radicalized" to NOT accept the indoctrinational lines of Transgenderism. (Ergo. Any reasonable person
would agree with Gender Ideology and so to be against its unimpeded spread is deemed "radical".)