Well, it means that the cog is directly tied to the motion of the pedals. Let me explain. You know that little gear thing attached to the back wheel? It has a bunch of 'teeth' on it and the chain rotates around it? That's the cog. On a fixed gear bike, that piece doesn't have a bearing in it and it is fixed to the back wheel. Typically, these cogs would have a ball bearing system to allow the wheel to spin independently of the cog. On a fixed gear bike, this isn't so.
So, on our bikes, if you pedal forward, the bike moves forward. If you pedal backwards, the bike moves backwards. You might ask, why would I want to do something like that?
Well, riding a fixie has grown in popularity because of its fundamental simplicity. Let's just say it would be tough to build a bike with fewer parts. You might know where I'm going with this, but fewer parts means...lighter!
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