Short for Trans-Exclusionary Radical Feminist. This term is used against (or screamed hysterically at) anyone who thinks a man who has had his private parts cut off is not biologically a woman. Trans activism is now being used to brainwash children who are too young to know what they're doing into basically sterilising themselves in order to depopulate the planet (usually organised by people who are not trans themselves). Most genuine trans people want to live their lives in peace and not bother anyone, and all this is not helping them one bit.
"You're a TERF because you think it's wrong for men to compete in women's sports"