Top Definition
A rare condition where one's penis is as flat as a piece of plywood. There are approximately 15 individuals who are known to suffer from this condition. It is contagious and is often linked with balltap prone males.
Phil: Hey Tim, why is your dick so flat?
Tim: Its a condition called Flat Dick Syndrome, or FDS. Please don't make fun of me.
Phil: Aww sorry. Can I touch it?
Tim: K.
by Magesh October 18, 2012

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