Top Definition
Ffk syndrome aka former fat kid syndrome is when a person who was fat as a kid, teenager, or just in general and lost a lot of weight. Their body may have slimmed out but their minds are those the same as a fat kid. They seem to recognize their unhealthy thoughts and surpress them daily and throughout their lives trying to continue a healthy life.
girl: omg I wanna eat cake
friend: girl your small, you can do stuff like that
Girl: no I can't! Lol I suffer from ffk syndrome girl, I'll pig out if I slip and I def don't wanna end up fat again
by Lizzie Czar October 09, 2015

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