So cis means not trans. I was born female and identify as a female so trans people would call me cis. Though I dont truly believe that I am the one who needs a qualifier. I am woman.
Terf is a slur used to silence people like me who speak about these issues. It stands for trans-exclusionary-radical feminist. It is used to dismiss, belittle, and insult those who dare question the trans movement. And terfs get lots and lots of threats.