A fork of Rural Dictionary
A pipeline in which one begins with relatively progressive views except for their dislike of transgender folks, and ends with alt-right or even fascist-esque views. Originates from the comic artist Sinfest, who began as a trans-exclusionary radical feminist, and devolved into a neo-Nazi.
Guy 1: It feels like yesterday Sam was super progressive aside from his transphobia, but now he's so hateful! Guy 2: Sounds like he went down the Sinfest Pipeline.