A belief system, arguably based on the Western construction of the gender binary that transgender people must experience a certain set of conditions—including gender dysphoria and a desire to transition medically—in order to legitimately “qualify” as transgender. While such attitudes may be prevalent among cisgender people, “truscum” is a slang term used primarily within transgender communities to denote other trans people who subscribe to this idea.
Gary used to be truscum—he once believed that people who didn’t want gender-affirming surgery weren’t truly transgender.