An abbreviation of cisgendered or cissexual heterosexual: a person that identifies as the sex they were born as, and are attracted to people of the sex opposite of theirs, who are usually also cisgendered or cissexual. Mostly used in social justice circles to describe people commenting on LGBT+ matters when they probably shouldn't be.
Disclaimer: use of labels might be seen as limiting, marginalizing or alienating. Attraction also applies to romantic attraction: heteroromantic, homoromantic, etc.
short for "cisgender and heterosexual;" an adjective used to describe anyone who identifies as the gender they were assigned at birth and is attracted to exclusively the opposite gender, ie someone who is not LGBT+
person 1: i'm trans and straight
person 2: ok
person 3: i'm cishet
person 2: ok
person 3: i'm cis and bi
person 2: ok