1 definition by 1234456hjk
When someone who was previously a fat/unattractive child loses weight or "glows up" and overcompensates for their past insecurities by acting out. Usually they end up acting like the same people who bullied them growing up.
Friend 1: Emily lost weight and now acts like she's better than everyone.
Friend 2: classic Former fat kid syndrome.
Friend 2: classic Former fat kid syndrome.
by 1234456hjk July 22, 2020