A fixed gear,the simplest form of bicycle, 1 gear with no coasting/freewheeling mechanism. Generally made on old road (AKA 10 speed) frames (different than , but similar in appearance to a "track bike" which is built up on a frame designed specifically for racing in a velodrome.) Its lack of extra bits is ideal for bike mechanics who don't enjoy fixing their own bikes after wrenching at work all day. Also enjoyed by annoying scenesters, the "Super Rookie," and "poor" college students who ride them because they think that it makes them cool.
I finally pulled off my derailleurs and lost my ability to coast on my bike, now i got me a fixie and am uber cool and can get the ladies without my Benz.