A mild pejorative used to denote Radical feminists who exclude, display hatred and disgust for, and otherwise belittle transgender women on the false and inaccurate claim that they are men, because biological essentialism is actually okay with these "feminists", only as long as it's a cudgel used to shut up those dirty transes.
Internet TERFs may use
talking points about how this is a "slur used to silence women and forced upon them by trans people", however, it should be noted that TERFS themselves coined the term TERF, and only pivoted positions when the
general public stopped agreeing with them. A slur is a loaded pejorative associated with immutable
characteristics. You cannot change being black, gay, trans, etc. and thus, insults directed at someone for being any of these are defined as slurs. TERFism is simply a scientifically incorrect ideology in baldfaced opposition to the American Psychiatric Association among
others, and as you can change an ideology or outlook, it is not a slur. There are male TERFs, after all, ideologies aren't exclusive. And by TERF logic, things such as "nazi" "communist" and "liberal" would be slurs as well.