Occurs when someone goes further than skipping leg day, but completely neglects them. The result is an individual who has scrawny legs and a masculine upper body.
Athlete 1: Man dude, I just benched 405!
Athlete 2: What's your squat?
Athlete 1: Squat? 135.
Bystander 1: Man, that guy has some serious Joe Swanson Syndrome.
When you break your legs by risking your fucking life! Only idiots do this, and the definition namer did.
Jin: Jim just got the Joe Swanson Syndrome by trying to jump on top of a tiny ant.
Jerry: WHAT THE FUCK?
Jin: Yup, your friend broke his legs!
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