Cisgender (often abbreviated to simply cis) is a term for people whose experiences of their own gender agree with the sex they were assigned at birth. Cisgender may also be defined as those who have "a gender identity or perform a gender role society considers appropriate for one's sex."
Many also noticed a shift in their friendships after they transitioned, with some struggling to make friends with cisgender men, unsure of the social cues of male friendship.
Not a derogatory term at all as many transgender people use it to describe people they know and sometimes love.
Cisgender is a term for someone who has a gender identity that aligns with what they were assigned at birth. The term was created for referring to "non-transgender" people without alienating transgender people. Basically if you were born a woman and do womanly things and like to be referred to as a woman, then you are a cisgender. Not a bad thing.
I don’t feel my gender in my bones the way some people do—the way my wife, who’s a cisgender lesbian, describes feeling about her femaleness.