Similar to third wheeling, a side-effect of feeling outcast or playing second fiddle to someone more popular or important.
Person 1: Hey, what's wrong with Marcus?
Person 2: Oh, he's dealing with supporting character syndrome.
Person 1: Oh, from Jason and Sarah?
Person 2: Yeah.
Person 2: Oh, he's dealing with supporting character syndrome.
Person 1: Oh, from Jason and Sarah?
Person 2: Yeah.
by mqqsie November 9, 2019