It means to hate on people who are under the average body size. Basically the arch nemesis or enemy of fat phobia, to be slimophobic
one must
journey to a skinny or slim human being and
tease or bully them because of it.
Bully: "Your skinny
haha".
Everyone:
haha.
Skinny child: "Yeah well your fat!"
Everyone: "oh my
gash body shaming fat phobic."
Skinny child: "but he was also-"
Quiet kid: "I'll take it from here, go home. Anyway imagine being slimophobic, stop the slimophobia but anyway goodbye".